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A political union is a type of state which is composed of or created out of smaller states. Unlike a personal union

Personal union

A personal union is the combination by which two or more different states have the same monarch while their boundaries, their laws and their interests remain distinct. It should not be confused with a federation which is internationally considered a single state...

, the individual states share a common government and the union is recognized internationally as a single political entity. A political union may also be called a legislative union or state union.

A union may be effected in a number of forms, broadly categorized as:

incorporating union
incorporating annexation
federal (or confederal) union
federative annexation
mixed unions.

Incorporating union

In an incorporating union a new state is created, the former states being entirely dissolved into the new state (albeit that some aspects may be preserved; see below "Preservation of interests").

Examples of incorporating union

Laws in Wales Acts 1535–1542 (also referred to as "The Act of Union") by which the legal system of Wales
Wales
Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

was annexed to England
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

.
The United Kingdom
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

- the united Kingdom of Great Britain
Kingdom of Great Britain
The former Kingdom of Great Britain, sometimes described as the 'United Kingdom of Great Britain', That the Two Kingdoms of Scotland and England, shall upon the 1st May next ensuing the date hereof, and forever after, be United into One Kingdom by the Name of GREAT BRITAIN. was a sovereign...

(Treaty of Union
Treaty of Union
The Treaty of Union is the name given to the agreement that led to the creation of the united kingdom of Great Britain, the political union of the Kingdom of England and the Kingdom of Scotland, which took effect on 1 May 1707...

1707), and the United Kingdom of Great Britain and Ireland
United Kingdom of Great Britain and Ireland
The United Kingdom of Great Britain and Ireland was the formal name of the United Kingdom during the period when what is now the Republic of Ireland formed a part of it....

(1801)
South Africa
Union of South Africa
The Union of South Africa is the historic predecessor to the present-day Republic of South Africa. It came into being on 31 May 1910 with the unification of the previously separate colonies of the Cape, Natal, Transvaal and the Orange Free State...

(1910
South Africa Act 1909
The South Africa Act 1909 was an Act of the British Parliament which created the Union of South Africa from the British Colonies of the Cape of Good Hope, Natal, Orange River Colony, and the Transvaal Colony. The Act also made provisions for admitting Rhodesia as a fifth province of the Union in...

)
Spain
Reconquista
The Reconquista was a period of almost 800 years in the Middle Ages during which several Christian kingdoms succeeded in retaking the Muslim-controlled areas of the Iberian Peninsula broadly known as Al-Andalus...

(process from 1037 to 1479) - however the realms of the Crown of Aragon
Crown of Aragon
The Crown of Aragon Corona d'Aragón Corona d'Aragó Corona Aragonum controlling a large portion of the present-day eastern Spain and southeastern France, as well as some of the major islands and mainland possessions stretching across the Mediterranean as far as Greece...

were formally separate from the Crown of Castile
Crown of Castile
The Crown of Castile was a medieval and modern state in the Iberian Peninsula that formed in 1230 as a result of the third and definitive union of the crowns and parliaments of the kingdoms of Castile and León upon the accession of the then King Ferdinand III of Castile to the vacant Leonese throne...

were not administratively unified with Castile until 1716 and 1833 respectively.
Yemen (1990)

Preservation of interests

Nevertheless a full incorporating union may preserve the laws and institutions of the former states, as happened in the creating of the United Kingdom. This may be simply a matter of practice or to comply with a guarantee given in the terms of the union. For example:

In the annexation of Brittany
Brittany
Brittany is a cultural and administrative region in the north-west of France. Previously a kingdom and then a duchy, Brittany was united to the Kingdom of France in 1532 as a province. Brittany has also been referred to as Less, Lesser or Little Britain...

to France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

in 1532, a guarantee was given as to the continuance of laws and of the Estates of Brittany
Estates of Brittany
The Estates of Brittany was the States Provincial for the province of Brittany in ancien regime France. It gathered members of the high clergy, a large number of nobles and delegates from the 42 towns and cities of Brittany...

(a guarantee revoked in 1789 at the French Revolution
French Revolution
The French Revolution , sometimes distinguished as the 'Great French Revolution' , was a period of radical social and political upheaval in France and Europe. The absolute monarchy that had ruled France for centuries collapsed in three years...

).
The Treaty of Union
Acts of Union 1707
The Acts of Union were two Parliamentary Acts - the Union with Scotland Act passed in 1706 by the Parliament of England, and the Union with England Act passed in 1707 by the Parliament of Scotland - which put into effect the terms of the Treaty of Union that had been agreed on 22 July 1706,...

for creating the united Kingdom of Great Britain
Kingdom of Great Britain
The former Kingdom of Great Britain, sometimes described as the 'United Kingdom of Great Britain', That the Two Kingdoms of Scotland and England, shall upon the 1st May next ensuing the date hereof, and forever after, be United into One Kingdom by the Name of GREAT BRITAIN. was a sovereign...

in 1707 contained a guarantee of the continuance of the civil laws and the existing courts in Scotland (a continuing guarantee).
In the Union creating the United Kingdom of Great Britain and Ireland
United Kingdom of Great Britain and Ireland
The United Kingdom of Great Britain and Ireland was the formal name of the United Kingdom during the period when what is now the Republic of Ireland formed a part of it....

in 1801, no such guarantee was given for the laws and courts of Ireland
Ireland
Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

, though they were continued as a matter of practice.
Tyrol
County of Tyrol
The County of Tyrol, Princely County from 1504, was a State of the Holy Roman Empire, from 1814 a province of the Austrian Empire and from 1867 a Cisleithanian crown land of Austria-Hungary...

was guaranteed that its Freischütz companies would not be posted to fight outside Tyrol without their consent (a guarantee revoked by the Austrian republic).

Incorporating annexation

In an incorporating annexation a state or states is united to and dissolved in an existing state, whose legal existence continues.

Annexation may be voluntary or, which is more frequent, by conquest .

Examples of incorporating annexation

England
Kingdom of England
The Kingdom of England was, from 927 to 1707, a sovereign state to the northwest of continental Europe. At its height, the Kingdom of England spanned the southern two-thirds of the island of Great Britain and several smaller outlying islands; what today comprises the legal jurisdiction of England...

formally annexed Wales under the two Laws in Wales Acts of 1535 and 1542
Prussia
Prussia
Prussia was a German kingdom and historic state originating out of the Duchy of Prussia and the Margraviate of Brandenburg. For centuries, the House of Hohenzollern ruled Prussia, successfully expanding its size by way of an unusually well-organized and effective army. Prussia shaped the history...

(1866)
Italian unification
Italian unification
Italian unification was the political and social movement that agglomerated different states of the Italian peninsula into the single state of Italy in the 19th century...

(1860–1861)
Serbia
Serbia
Serbia , officially the Republic of Serbia , is a landlocked country located at the crossroads of Central and Southeast Europe, covering the southern part of the Carpathian basin and the central part of the Balkans...

(with Montenegro
Montenegro
Montenegro Montenegrin: Crna Gora Црна Гора , meaning "Black Mountain") is a country located in Southeastern Europe. It has a coast on the Adriatic Sea to the south-west and is bordered by Croatia to the west, Bosnia and Herzegovina to the northwest, Serbia to the northeast and Albania to the...

) (1918)

Federal or Confederal union

In a federal or confederal union the states continue in existence but place themselves under a new federal authority. The federal state alone will be the state in international law though the federated states retain an existence in domestic law.

Examples of federal or confederal union

Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

(1901)
Cameroon
Cameroon
Cameroon, officially the Republic of Cameroon , is a country in west Central Africa. It is bordered by Nigeria to the west; Chad to the northeast; the Central African Republic to the east; and Equatorial Guinea, Gabon, and the Republic of the Congo to the south. Cameroon's coastline lies on the...

(1961–1970)
Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

(1867
Constitution Act, 1867
The Constitution Act, 1867 , is a major part of Canada's Constitution. The Act created a federal dominion and defines much of the operation of the Government of Canada, including its federal structure, the House of Commons, the Senate, the justice system, and the taxation system...

)
German Empire
German Empire
The German Empire refers to Germany during the "Second Reich" period from the unification of Germany and proclamation of Wilhelm I as German Emperor on 18 January 1871, to 1918, when it became a federal republic after defeat in World War I and the abdication of the Emperor, Wilhelm II.The German...

(1871–1919)
India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

(1950)
Polish–Lithuanian union (1569)
Serbia and Montenegro
Serbia and Montenegro
Serbia and Montenegro was a country in southeastern Europe, formed from two former republics of the Socialist Federal Republic of Yugoslavia : Serbia and Montenegro. Following the breakup of Yugoslavia, it was established in 1992 as a federation called the Federal Republic of Yugoslavia...

(2003–2006)
Switzerland
Switzerland
Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

(confederation from 1291)
Tanzania
Tanzania
The United Republic of Tanzania is a country in East Africa bordered by Kenya and Uganda to the north, Rwanda, Burundi, and the Democratic Republic of the Congo to the west, and Zambia, Malawi, and Mozambique to the south. The country's eastern borders lie on the Indian Ocean.Tanzania is a state...

(1964)
The United Arab Emirates
United Arab Emirates
The United Arab Emirates, abbreviated as the UAE, or shortened to "the Emirates", is a state situated in the southeast of the Arabian Peninsula in Western Asia on the Persian Gulf, bordering Oman, and Saudi Arabia, and sharing sea borders with Iraq, Kuwait, Bahrain, Qatar, and Iran.The UAE is a...

(1971)
Union of Soviet Socialist Republics (1922—1991)
The United States of America (in confederal union under the Articles of Confederation
Articles of Confederation
The Articles of Confederation, formally the Articles of Confederation and Perpetual Union, was an agreement among the 13 founding states that legally established the United States of America as a confederation of sovereign states and served as its first constitution...

, beginning in 1781 and becoming a federal union under the United States Constitution
United States Constitution
The Constitution of the United States is the supreme law of the United States of America. It is the framework for the organization of the United States government and for the relationship of the federal government with the states, citizens, and all people within the United States.The first three...

in 1788)

Federal or Confederal annexation

If a state becomes a federated unit of another existing state, the latter continuing its legal existence, then that is a federal annexation. The new federated state thus ceases to be a state in international law but retains its legal existence in domestic law, subsidiary to the federal authority.

Examples of federal annexation

British Columbia
British Columbia
British Columbia is the westernmost of Canada's provinces and is known for its natural beauty, as reflected in its Latin motto, Splendor sine occasu . Its name was chosen by Queen Victoria in 1858...

with Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

(1871)
Eritrea
Eritrea
Eritrea , officially the State of Eritrea, is a country in the Horn of Africa. Eritrea derives it's name from the Greek word Erethria, meaning 'red land'. The capital is Asmara. It is bordered by Sudan in the west, Ethiopia in the south, and Djibouti in the southeast...

with Ethiopia
Ethiopia
Ethiopia , officially known as the Federal Democratic Republic of Ethiopia, is a country located in the Horn of Africa. It is the second-most populous nation in Africa, with over 82 million inhabitants, and the tenth-largest by area, occupying 1,100,000 km2...

(1951 to 1962)
Geneva
Geneva
Geneva In the national languages of Switzerland the city is known as Genf , Ginevra and Genevra is the second-most-populous city in Switzerland and is the most populous city of Romandie, the French-speaking part of Switzerland...

with Switzerland
Switzerland
Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

(1815)
Newfoundland
Dominion of Newfoundland
The Dominion of Newfoundland was a British Dominion from 1907 to 1949 . The Dominion of Newfoundland was situated in northeastern North America along the Atlantic coast and comprised the island of Newfoundland and Labrador on the continental mainland...

with Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

(1949)
Texas
Republic of Texas
The Republic of Texas was an independent nation in North America, bordering the United States and Mexico, that existed from 1836 to 1846.Formed as a break-away republic from Mexico by the Texas Revolution, the state claimed borders that encompassed an area that included all of the present U.S...

with the United States of America (1846)

(Arguably Hawaii

Hawaii

Hawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...

with the United States of America is an example, but Hawaii was first annexed without statehood in 1895.)

Mixed unions

The unification of Italy involved a mixture of unions. The kingdom consolidated around the Kingdom of Sardinia

Kingdom of Sardinia

The Kingdom of Sardinia consisted of the island of Sardinia first as a part of the Crown of Aragon and subsequently the Spanish Empire , and second as a part of the composite state of the House of Savoy . Its capital was originally Cagliari, in the south of the island, and later Turin, on the...

. Several states voluntarily united with Sardinia to create the Kingdom of Italy

Kingdom of Italy (1861–1946)

The Kingdom of Italy was a state forged in 1861 by the unification of Italy under the influence of the Kingdom of Sardinia, which was its legal predecessor state...

. Others, the Kingdom of the Two Sicilies

Kingdom of the Two Sicilies

The Kingdom of the Two Sicilies, commonly known as the Two Sicilies even before formally coming into being, was the largest and wealthiest of the Italian states before Italian unification...

and the Papal States

Papal States

The Papal State, State of the Church, or Pontifical States were among the major historical states of Italy from roughly the 6th century until the Italian peninsula was unified in 1861 by the Kingdom of Piedmont-Sardinia .The Papal States comprised territories under...

, were conquered and annexed.

The unification of Germany was ultimately a confederal union, but it began in earnest by Prussia's annexation of numerous petty states in 1866.

Historical unions

Bulgarian unification
Bulgarian unification
The Unification of Bulgaria was the act of unification of the Principality of Bulgaria and the then-Ottoman province of Eastern Rumelia in the autumn of 1885. It was co-ordinated by the Bulgarian Secret Central Revolutionary Committee...

in 1885, after the 1396 Ottoman conquest.
Chinese reunification (1928)
Chinese reunification (1928)
Chinese reunification , better known in Chinese history as the Northeast Flag Replacement , is a historical term that refers to Zhang Xueliang's announcement on December 29, 1928 on replacing all banners of the Beiyang Government in Manchuria to the flag of the Nationalist Government, thus...

or "Northeast Flag Replacement" proclaimed victory of Guangzhou/Nanjing government over Beiyang government after the 1912 division.
German reunification
German reunification
German reunification was the process in 1990 in which the German Democratic Republic joined the Federal Republic of Germany , and when Berlin reunited into a single city, as provided by its then Grundgesetz constitution Article 23. The start of this process is commonly referred by Germans as die...

in 1990, divided since the 1949 division
History of Germany since 1945
As a consequence of the defeat of Nazi Germany in World War II Germany was split between the two global blocs in the East and West, a period known as the division of Germany. While seven million prisoners and forced laborers left Germany, over 10 million German speaking refugees arrived there from...

decided at the Potsdam Conference
Potsdam Conference
The Potsdam Conference was held at Cecilienhof, the home of Crown Prince Wilhelm Hohenzollern, in Potsdam, occupied Germany, from 16 July to 2 August 1945. Participants were the Soviet Union, the United Kingdom, and the United States...

in August 1945.
- German unification in 1866-71, divided since 1806 after the division of Holy Roman Empire.
- Anschluss
  Anschluss
  The Anschluss , also known as the ', was the occupation and annexation of Austria into Nazi Germany in 1938....
  
  (1938 Nazi reunification of "Lesser Germany" and Austria into "Greater Germany")
Italian unification
Italian unification
Italian unification was the political and social movement that agglomerated different states of the Italian peninsula into the single state of Italy in the 19th century...

1815-71, divided
Italy in the Middle Ages
This is the history of Italy during the Middle Ages.- Transition from Late Antiquity :Italy was invaded by the Visigoths in the 5th century, and Rome was sacked by Alaric in 410. The last Western Roman Emperor, Romulus Augustus, was deposed in 476 by an Eastern Germanic general, Odoacer...

since the 6th century Ostrogoths.
Polish reunification in 1918-22, divided since 24 October 1795.
Vietnam
Vietnam
Vietnam – sometimes spelled Viet Nam , officially the Socialist Republic of Vietnam – is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea –...

at the end of the Vietnam War
Vietnam War
The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

in 1976, divided since 1954.
Yemenite reunification
Yemenite reunification
Yemeni unification took place on May 22, 1990, when the area of the People's Democratic Republic of Yemen was united with the Yemen Arab Republic , forming the Republic of Yemen.-Background:...

in 1990, divided since the collapse of the Ottoman Empire
Ottoman Empire
The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

in 1918.
Denmark
Denmark
Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...

and the northern part of South Jutland in 1920. See Schleswig Plebiscites
Schleswig Plebiscites
The Schleswig Plebiscites were two plebiscites, organized according to section XII, articles 109 to 114 of the Treaty of Versailles of June 28, 1919, in order to determine the future border between Denmark and Germany through the former duchy of Schleswig...

.

Unification movements

At various times various nationalist and irredentist movements promoted ideas of restoration or unification in various places.
>

Reunification Movement	Divided since	Areas affected (at maximum extent)
United States of Africa United States of Africa The United States of Africa is a proposed name for the concept of a federation of some or all of the 55 sovereign states of Africa.Former Libyan leader Muammar al-Gaddafi, who was the 2009 Chairperson of the African Union , advanced the idea of a United States of Africa at two regional African...	Never united	Africa Africa Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area...
Greater Serbia Greater Serbia The term Greater Serbia or Great Serbia applies to the Serbian nationalist and irredentist ideology directed towards the creation of a Serbian land which would incorporate all regions of traditional significance to the Serbian nation...	Never united	Greater Serbia Greater Serbia The term Greater Serbia or Great Serbia applies to the Serbian nationalist and irredentist ideology directed towards the creation of a Serbian land which would incorporate all regions of traditional significance to the Serbian nation... Serbia Republic of Macedonia Albania south Hungary Kingdom of Montenegro Independent State of Croatia or Serbia Republic of Macedonia Kingdom of Montenegro Republic of Serbian Krajina Republika Srpska United States of Serbia from 1848 Serbia Republic of Macedonia Kingdom of Montenegro Kingdom of Bulgaria
Greater Croatia Greater Croatia Greater Croatia is a term applied to certain currents within Croatian nationalism. In one sense, it refers to the territorial scope of the Croatian people, emphasising the ethnicity of those Croats living outside Croatia...	1945	Independent State of Croatia Vojvodina part of Kingdom of Montenegro
Greater Bulgaria Greater Bulgaria Greater Bulgaria is term to identify the territory associated with a historical national state and a modern Bulgarian irredentist nationalist movement which would include most of Macedonia, Thrace and Moesia...	1918	Kingdom of Bulgaria Republic of Macedonia part of Serbia part of Greece
Greater Albania Greater Albania Greater Albania or Ethnic Albania is an irredentist concept of lands outside the borders of the Republic of Albania that are considered part of a greater national homeland by most Albanians, based on the present-day or historical presence of Albanian populations in those areas...	1945	Albania Kingdom of Montenegro Republic of Kosovo part of Greece Republic of Macedonia
Balkan Federation Balkan Federation The Balkan Federation was a project about the creation of a Balkan federation or confederation, based mainly on left political ideas.The concept of a Balkan federation emerged at the late 19th century from among left political forces in the region...	Never united	Balkan Federation Balkan Federation The Balkan Federation was a project about the creation of a Balkan federation or confederation, based mainly on left political ideas.The concept of a Balkan federation emerged at the late 19th century from among left political forces in the region... Serbia Republic of Macedonia Albania Independent State of Croatia Kingdom of Montenegro Slovenia Kingdom of Bulgaria Greece Kingdom of Romania Serbo-greek federation Serbia Republic of Macedonia Greece
Slavic Federation Pan-Slavism Pan-Slavism was a movement in the mid-19th century aimed at unity of all the Slavic peoples. The main focus was in the Balkans where the South Slavs had been ruled for centuries by other empires, Byzantine Empire, Austria-Hungary, the Ottoman Empire, and Venice...	Never united	Russia Ukraine Belarus Poland Slovakia Czech Republic Serbia Slovenia Kingdom of Bulgaria Kingdom of Montenegro Republic of Macedonia Independent State of Croatia
Arab League Pan-Arabism Pan-Arabism is an ideology espousing the unification--or, sometimes, close cooperation and solidarity against perceived enemies of the Arabs--of the countries of the Arab world, from the Atlantic Ocean to the Arabian Sea. It is closely connected to Arab nationalism, which asserts that the Arabs...	1258	Algeria Bahrain Comoros Djibouti Egypt Iraq Jordan Kuwait Lebanon Libya Mauritania Morocco Oman Qatar Saudi Arabia Somalia Sudan Syria Tunisia United Arab Emirates Yemen
ASEAN	Never United	Brunei Myanmar Cambodia East Timor Indonesia Laos Malaysia Papua New Guinea Philippines Singapore Thailand Vietnam
Australia and New Zealand	1942	Australia New Zealand
Benelux Benelux The Benelux is an economic union in Western Europe comprising three neighbouring countries, Belgium, the Netherlands, and Luxembourg. These countries are located in northwestern Europe between France and Germany...	1839	Belgium Luxembourg Netherlands
British Isles United Kingdom of Great Britain and Ireland The United Kingdom of Great Britain and Ireland was the formal name of the United Kingdom during the period when what is now the Republic of Ireland formed a part of it....	1922	United Kingdom Republic of Ireland
Central America Union Federal Republic of Central America The Federal Republic of Central America, known as the United Provinces of Central America in its first year of creation, was a sovereign state in Central America, which consisted of the territories of the former Captaincy General of Guatemala of New Spain...	1838	Belize Costa Rica El Salvador Guatemala Honduras Nicaragua
Central Asian Union Central Asian Union A Central Asian Union was proposed by Kazakhstan President Nursultan Nazarbayev on April 26, 2007, in order to create an economic and political union similar to that of the EU encompassing the five former Soviet Central Asian republics of Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and...	1991	Kazakhstan Kyrgyzstan Uzbekistan Tajikistan Turkmenistan
Greater China Greater China Greater China is a term used to refer to mainland China, Hong Kong, Macau and Taiwan. As a "phrase of the moment", the precise meaning is not entirely clear, and people may use it for only the commercial ties, only the cultural actions, or even as a euphemism for the Two Chinas, while others may...	1895/1911/1949 Chinese Civil War The Chinese Civil War was a civil war fought between the Kuomintang , the governing party of the Republic of China, and the Communist Party of China , for the control of China which eventually led to China's division into two Chinas, Republic of China and People's Republic of...	People's Republic of China Republic of China Mongolia
CANZUK Commonwealth unification movement The Commonwealth unification movement is a largely unorganised socio-political movement advocating closer political affiliation between member states of the Commonwealth of Nations. In some cases, this movement seeks the eventual formation of some type of supranational, federalist or economic union...	c. 1931 British Empire The British Empire comprised the dominions, colonies, protectorates, mandates and other territories ruled or administered by the United Kingdom. It originated with the overseas colonies and trading posts established by England in the late 16th and early 17th centuries. At its height, it was the...	Australia Canada New Zealand United Kingdom
Cyprus Annan Plan for Cyprus The Annan Plan was a United Nations proposal to resolve the Cyprus dispute, reuniting the breakaway Northern Cyprus with the Republic of Cyprus. The proposal was to restructure Cyprus as the "United Cyprus Republic", which would be a federation of two states. It was revised a number of times before...	1974	Cyprus Turkish Republic of Northern Cyprus United Kingdom (Akrotiri and Dhekelia Akrotiri and Dhekelia The Sovereign Base Areas of Akrotiri and Dhekelia are two British-administered areas comprising a British Overseas Territory on the island of Cyprus administered as Sovereign Base Areas of the United Kingdom... )
Czechoslovakia Czechoslovakia Czechoslovakia or Czecho-Slovakia was a sovereign state in Central Europe which existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until 1992...	1992	Czech Republic Slovakia
DACH	1648	Germany Austria Switzerland Liechtenstein
East African Federation East African Federation East African Federation is the name of the proposed political union of the member nations of the East African Community, such that the five member states would federate into a single sovereign state....	Never United	Burundi Kenya Rwanda Tanzania Uganda
United States of Europe United States of Europe Since the 1950s, European integration has seen the development of a supranational system of governance, as its institutions move further from the concept of simple intergovernmentalism. However, with the Maastricht Treaty of 1993, new intergovernmental elements have been introduced alongside the...	Never United	Austria Belgium Kingdom of Bulgaria Cyprus Czech Republic Denmark Estonia Finland Early Modern France Germany Greece Hungary Republic of Ireland Italy Latvia Lithuania Luxembourg Malta Netherlands Poland Portugal Kingdom of Romania Slovakia Slovenia Spain Sweden United Kingdom
Greater Finland Greater Finland Greater Finland was an idea which was born in some irredentist movements emphasizing pan-Finnicism and expressed a Finnish version of pre-World War II European nationalism. It was imagined to include Finland as well as territories inhabited by ethnically-related Finnic peoples: Finns, Karelians,...	1940-44	Finland Russia (Karelia Republic of Karelia The Republic of Karelia is a federal subject of Russia .-Geography:The republic is located in the northwestern part of Russia, taking intervening position between the basins of White and Baltic seas... )
North American Union North American Union The North American Union is a theoretical economic union, in some instances also a political union, of Canada, Mexico, and the United States...	Never united	Canada Mexico partially accepted United States
Greek reunification Megali Idea The Megali Idea was an irredentist concept of Greek nationalism that expressed the goal of establishing a Greek state that would encompass all ethnic Greek-inhabited areas, since large Greek populations after the restoration of Greek independence in 1830 still lived under Ottoman rule.The term...	Medieval period	Greece Cyprus Turkey (Eastern Thrace,Western and Northwestern Asia Minor Asia Minor Asia Minor is a geographical location at the westernmost protrusion of Asia, also called Anatolia, and corresponds to the western two thirds of the Asian part of Turkey... , Pontus Pontus Pontus or Pontos is a historical Greek designation for a region on the southern coast of the Black Sea, located in modern-day northeastern Turkey. The name was applied to the coastal region in antiquity by the Greeks who colonized the area, and derived from the Greek name of the Black Sea: Πόντος... ) Kingdom of Bulgaria (Eastern Rumelia Eastern Rumelia Eastern Rumelia or Eastern Roumelia was an administratively autonomous province in the Ottoman Empire and Principality of Bulgaria from 1878 to 1908. It was under full Bulgarian control from 1885 on, when it willingly united with the tributary Principality of Bulgaria after a bloodless revolution... ) Albania (Northern Epirus Northern Epirus Northern Epirus is a term used to refer to those parts of the historical region of Epirus, in the western Balkans, that are part of the modern Albania. The term is used mostly by Greeks and is associated with the existence of a substantial ethnic Greek population in the region... including northern areas of Apollonia (Illyria) Apollonia, Illyria Apollonia was an ancient Greek city in Illyria, located on the right bank of the Aous river . Its ruins are situated in the Fier region, near the village of Pojani, in modern-day Albania... , Vlorë Vlorë Vlorë is one of the biggest towns and the second largest port city of Albania, after Durrës, with a population of about 94,000 . It is the city where the Albanian Declaration of Independence was proclaimed on November 28, 1912... and Berat Berat Berat is a town located in south-central Albania. As of 2009, the town has an estimated population of around 71,000 people. It is the capital of both the District of Berat and the larger County of Berat... ) Republic of Macedonia (Monastiri area including the northern city of Ohrid Ohrid Ohrid is a city on the eastern shore of Lake Ohrid in the Republic of Macedonia. It has about 42,000 inhabitants, making it the seventh largest city in the country. The city is the seat of Ohrid Municipality. Ohrid is notable for having once had 365 churches, one for each day of the year and has... and area around Strumica Strumica Strumica is the largest city in eastern Macedonia, near the Novo Selo-Petrich border crossing with Bulgaria. About 100,000 people live in the region surrounding the city. The city is named after the Strumica River which runs through it... and Gevgelija Gevgelija Gevgelija is a town with a population of 15,685 located in the very southeast of the Republic of Macedonia along the banks of the Vardar River, situated at the country's main border with Greece , the point which links the motorway from Skopje and three other former Yugoslav capitals with... )
Iberian Federacy	1580–1640	Andorra Portugal Spain United Kingdom (Gibraltar Gibraltar Gibraltar is a British overseas territory located on the southern end of the Iberian Peninsula at the entrance of the Mediterranean. A peninsula with an area of , it has a northern border with Andalusia, Spain. The Rock of Gibraltar is the major landmark of the region... )
Undivided India	1947	India Bangladesh Pakistan(excluding Balochistan Balochistan Balochistan or Baluchistan is a region which covers parts of Afghanistan, Iran and Pakistan. It can also refer to one of several modern and historical territories within that region:... and Khyber-Pakhtunkhwa) Myanmar Sri Lanka Maldives
United Ireland United Ireland A united Ireland is the term used to refer to the idea of a sovereign state which covers all of the thirty-two traditional counties of Ireland. The island of Ireland includes the territory of two independent sovereign states: the Republic of Ireland, which covers 26 counties of the island, and the...	1920-22	Republic of Ireland United Kingdom (Northern Ireland Northern Ireland Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west... )
Korean reunification Korean reunification Korean reunification refers to the hypothetical future reunification of North Korea and South Korea under a single government...	1945	North Korea South Korea
Latin American Union Latin American integration The integration of Latin America has a history going back to Spanish American and Brazilian independence, when there was discussion of creating a regional state or confederation of Latin American nations to protect the area's newly won autonomy...	Never united	Latin America Latin America Latin America is a region of the Americas where Romance languages – particularly Spanish and Portuguese, and variably French – are primarily spoken. Latin America has an area of approximately 21,069,500 km² , almost 3.9% of the Earth's surface or 14.1% of its land surface area... Caribbean Caribbean The Caribbean is a crescent-shaped group of islands more than 2,000 miles long separating the Gulf of Mexico and the Caribbean Sea, to the west and south, from the Atlantic Ocean, to the east and north...
Malaya Singapore in Malaysia On 16 September 1963, which was also Lee Kuan Yew's 40th birthday, Singapore merged with the Federation of Malaya alongside Sabah and Sarawak to form Malaysia...	1965	Singapore Malaysia
Greater Romania Greater Romania The Greater Romania generally refers to the territory of Romania in the years between the First World War and the Second World War, the largest geographical extent of Romania up to that time and its largest peacetime extent ever ; more precisely, it refers to the territory of the Kingdom of...	1944	Moldova Kingdom of Romania
Union of Russia and Belarus Union of Russia and Belarus The Union State , semi-officially known as Union State of Russia and Belarus , is a supranational entity consisting of the Russian Federation and the Republic of Belarus.- Creation :...	1991	Belarus Russia
Samoa Samoa Samoa , officially the Independent State of Samoa, formerly known as Western Samoa is a country encompassing the western part of the Samoan Islands in the South Pacific Ocean. It became independent from New Zealand in 1962. The two main islands of Samoa are Upolu and one of the biggest islands in...	1900	Samoa American Samoa
Scandinavian reunification Kalmar Union The Kalmar Union is a historiographical term meaning a series of personal unions that united the three kingdoms of Denmark, Norway , and Sweden under a single monarch, though intermittently and with a population...	1536	Denmark Sweden Norway Iceland Greenland Finland Åland Islands
Transcaucasus	1991	Armenia Azerbaijan Georgia (country)
West Indies Federation West Indies Federation The West Indies Federation, also known as the Federation of the West Indies, was a short-lived Caribbean federation that existed from January 3, 1958, to May 31, 1962. It consisted of several Caribbean colonies of the United Kingdom...	1962	Anguilla Antigua and Barbuda Barbados Cayman Islands Dominica Grenada Jamaica Montserrat Saint Kitts and Nevis Saint Lucia Saint Vincent and the Grenadines Trinidad and Tobago Turks and Caicos Islands
Yugoslavia Yugo-nostalgia Yugo-nostalgia is a little-studied psychological and cultural phenomenon occurring among citizens of the former Socialist Federal Republic of Yugoslavia...	1992	Bosnia and Herzegovina Independent State of Croatia Republic of Kosovo Republic of Macedonia Kingdom of Montenegro Serbia Slovenia

Supranational and continental unions

In addition to regional movements, supranational organizations

Supranational union

Supranationalism is a method of decision-making in multi-national political communities, wherein power is transferred or delegated to an authority by governments of member states. The concept of supranational union is sometimes used to describe the European Union, as a new type of political entity...

that promote progressive integration between its members gained force in the end of the 20th century. Most of these organization are inspired on the European Union

European Union

The European Union is an economic and political union of 27 independent member states which are located primarily in Europe. The EU traces its origins from the European Coal and Steel Community and the European Economic Community , formed by six countries in 1958...

and, although most of the states are reluctant with it, the concept of unionism is often present.

Current supranational unions:

African Union
African Union
The African Union is a union consisting of 54 African states. The only all-African state not in the AU is Morocco. Established on 9 July 2002, the AU was formed as a successor to the Organisation of African Unity...

(AU)
European Union
European Union
The European Union is an economic and political union of 27 independent member states which are located primarily in Europe. The EU traces its origins from the European Coal and Steel Community and the European Economic Community , formed by six countries in 1958...

(EU)
Union of South American Nations (UNASUR)

Proposed supranational unions:

Arab Union
Arab Union
The term Arab Union was first used when the British promised Arabs a united independent Arab state; after that failed to happen due to the Sykes–Picot Agreement, Arabs since have called for an Arab Union, with Gamal Abdel Nasser trying several Arab Federations, alongside with other Arab states,...

, from Arab League
Arab League
The Arab League , officially called the League of Arab States , is a regional organisation of Arab states in North and Northeast Africa, and Southwest Asia . It was formed in Cairo on 22 March 1945 with six members: Egypt, Iraq, Transjordan , Lebanon, Saudi Arabia, and Syria. Yemen joined as a...
Asian Union, from Asia Cooperation Dialogue
Central Asian Union
Central Asian Union
A Central Asian Union was proposed by Kazakhstan President Nursultan Nazarbayev on April 26, 2007, in order to create an economic and political union similar to that of the EU encompassing the five former Soviet Central Asian republics of Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and...
Community of Latin American and Caribbean States
Community of Latin American and Caribbean States
thumb|300px|Community of Latin American and Caribbean States.Total population: 591.662 million Total area: 20.438 million sq kmDensity: 28.95/sq km...

, from Rio Group
Rio Group
- List of Summit meetings :- See also :* Community of Latin American and Caribbean States, possible successor of the Rio Group* Union of South American Nations...

and CARICOM
North American Union
North American Union
The North American Union is a theoretical economic union, in some instances also a political union, of Canada, Mexico, and the United States...

, from North American Free Trade Agreement
North American Free Trade Agreement
The North American Free Trade Agreement or NAFTA is an agreement signed by the governments of Canada, Mexico, and the United States, creating a trilateral trade bloc in North America. The agreement came into force on January 1, 1994. It superseded the Canada – United States Free Trade Agreement...

(NAFTA)
Pacific Union
Pacific Union
The Pacific Union is a proposed development of the Pacific Islands Forum, suggested in 2003 by a committee of the Australian Senate, into a political and economic intergovernmental community. The union, if formed, will have a common charter, institutions and currency...

, from Pacific Islands Forum
Pacific Islands Forum
The Pacific Islands Forum is an inter-governmental organization that aims to enhance cooperation between the independent countries of the Pacific Ocean. It was founded in 1971 as the South Pacific Forum...

Organizations that plan to evolve into supranational unions:

Association of Southeast Asian Nations
Association of Southeast Asian Nations
The Association of Southeast Asian Nations, commonly abbreviated ASEAN rarely ), is a geo-political and economic organization of ten countries located in Southeast Asia, which was formed on 8 August 1967 by Indonesia, Malaysia, the Philippines, Singapore and Thailand. Since then, membership has...

(ASEAN)
Caribbean Community
Caribbean Community
The Caribbean Community is an organisation of 15 Caribbean nations and dependencies. CARICOM's main purposes are to promote economic integration and cooperation among its members, to ensure that the benefits of integration are equitably shared, and to coordinate foreign policy...

(CARICOM)
Central American Integration System
Central American Integration System
Central American Integration System is the economic, cultural and political organization of Central American states since February 1, 1993. It was on December 13, 1991, however, when all the countries of the ODECA signed the Protocol of Tegucigalpa which extended the earlier cooperation in search...

(SICA)
Cooperation Council for the Arab States of the Gulf
Cooperation Council for the Arab States of the Gulf
The Cooperation Council for the Arab States of the Gulf , also known as the Gulf Cooperation Council , is a political and economic union of the Arab states bordering the Persian Gulf and constituting the Arabian Peninsula, namely Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and United Arab Emirates...

(CCASG)
Eurasian Economic Community
Eurasian Economic Community
The Eurasian Economic Community originated from the Commonwealth of Independent States customs union between Belarus, Russia and Kazakhstan on 29 March 1996...

(EurAsEC)
Organisation of Eastern Caribbean States
Organisation of Eastern Caribbean States
The Organisation of Eastern Caribbean States , created in 1981, is an inter-governmental organisation dedicated to economic harmonisation and integration, protection of human and legal rights, and the encouragement of good governance between countries and dependencies in the Eastern Caribbean...

(OECS)
South Asian Association for Regional Cooperation
South Asian Association for Regional Cooperation
The South Asian Association for Regional Cooperation is an organisation of South Asian nations, founded in December 1985 by Ziaur Rahman and dedicated to economic, technological, social, and cultural development emphasising collective self-reliance. Its seven founding members are Bangladesh,...

(SAARC)
Union State (Russia and Belarus)

Academic analysis

The political position of the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

is often discussed; and former states like Serbia and Montenegro

Serbia and Montenegro

Serbia and Montenegro was a country in southeastern Europe, formed from two former republics of the Socialist Federal Republic of Yugoslavia : Serbia and Montenegro. Following the breakup of Yugoslavia, it was established in 1992 as a federation called the Federal Republic of Yugoslavia...

(2003–2006), the Soviet Union

Soviet Union

The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

(1922–1991) and the United Arab Republic

United Arab Republic

The United Arab Republic , often abbreviated as the U.A.R., was a sovereign union between Egypt and Syria. The union began in 1958 and existed until 1961, when Syria seceded from the union. Egypt continued to be known officially as the "United Arab Republic" until 1971. The President was Gamal...

(1958–1961).

Lord Durham

John Lambton, 1st Earl of Durham

John George Lambton, 1st Earl of Durham GCB, PC , also known as "Radical Jack" and commonly referred to in history texts simply as Lord Durham, was a British Whig statesman, colonial administrator, Governor General and high commissioner of British North America...

was widely regarded as one of the most important thinkers in the history of the British Empire

British Empire

The British Empire comprised the dominions, colonies, protectorates, mandates and other territories ruled or administered by the United Kingdom. It originated with the overseas colonies and trading posts established by England in the late 16th and early 17th centuries. At its height, it was the...

's constitutional evolution. He articulated clearly the difference between a full legislative union and a federation

Federation

A federation , also known as a federal state, is a type of sovereign state characterized by a union of partially self-governing states or regions united by a central government...

. In his 1839 Report

Report on the Affairs of British North America (1839)

The Report on the Affairs of British North America, commonly known as The Durham Report, is an important document in the history of Quebec, Ontario, Canada and the British Empire....

, in discussing the proposed union of Upper and Lower Canada

The Canadas

The Canadas is the collective name for Upper Canada and Lower Canada, two British colonies in Canada. They were both created by the Constitutional Act of 1791 and abolished in 1841 with the union of Upper and Lower Canada....

, he says:

Two kinds of union have been proposed – federal and legislative. By the first, the separate legislature of each province would be preserved in its present form and retain almost all its present attributes of internal legislation, the federal legislature exercising no power save in those matters which may have been expressly ceded to it by the constituent provinces. A legislative union would imply a complete incorporation of the provinces included in it under one legislature, exercising universal and sole legislative authority over all of them in exactly the same manner as the Parliament legislates alone for the whole of the British Isles.