President
Overview
 
A president is a leader
Leader
A leader is one who influences or leads others.Leader may also refer to:- Newspapers :* Leading article, a piece of writing intended to promote an opinion, also called an editorial* The Leader , published 1909–1967...

 of an organization
Organization
An organization is a social group which distributes tasks for a collective goal. The word itself is derived from the Greek word organon, itself derived from the better-known word ergon - as we know `organ` - and it means a compartment for a particular job.There are a variety of legal types of...

, company
Company
A company is a form of business organization. It is an association or collection of individual real persons and/or other companies, who each provide some form of capital. This group has a common purpose or focus and an aim of gaining profits. This collection, group or association of persons can be...

, trade union
Trade union
A trade union, trades union or labor union is an organization of workers that have banded together to achieve common goals such as better working conditions. The trade union, through its leadership, bargains with the employer on behalf of union members and negotiates labour contracts with...

, university
University
A university is an institution of higher education and research, which grants academic degrees in a variety of subjects. A university is an organisation that provides both undergraduate education and postgraduate education...

, or country
Country
A country is a region legally identified as a distinct entity in political geography. A country may be an independent sovereign state or one that is occupied by another state, as a non-sovereign or formerly sovereign political division, or a geographic region associated with a previously...

.

Etymologically
Etymology
Etymology is the study of the history of words, their origins, and how their form and meaning have changed over time.For languages with a long written history, etymologists make use of texts in these languages and texts about the languages to gather knowledge about how words were used during...

, a president is one who presides, who sits in leadership (from Latin
Latin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 pre- "before" + sedere "to sit"; giving the term praeses
Praeses
Praeses , is a Latin word meaning "Seated in front of, i.e. at the head ", has both ancient and modern uses.-Roman imperial use:...

). Originally, the term referred to the presiding officer of a ceremony or meeting (i.e., chairman), but today it most commonly refers to an official. Among other things, president today is a common title for the heads of state
Head of State
A head of state is the individual that serves as the chief public representative of a monarchy, republic, federation, commonwealth or other kind of state. His or her role generally includes legitimizing the state and exercising the political powers, functions, and duties granted to the head of...

 of most republic
Republic
A republic is a form of government in which the people, or some significant portion of them, have supreme control over the government and where offices of state are elected or chosen by elected people. In modern times, a common simplified definition of a republic is a government where the head of...

s, whether popularly elected
Election
An election is a formal decision-making process by which a population chooses an individual to hold public office. Elections have been the usual mechanism by which modern representative democracy operates since the 17th century. Elections may fill offices in the legislature, sometimes in the...

, chosen by the legislature
Legislature
A legislature is a kind of deliberative assembly with the power to pass, amend, and repeal laws. The law created by a legislature is called legislation or statutory law. In addition to enacting laws, legislatures usually have exclusive authority to raise or lower taxes and adopt the budget and...

 or by a special electoral college
Electoral college
An electoral college is a set of electors who are selected to elect a candidate to a particular office. Often these represent different organizations or entities, with each organization or entity represented by a particular number of electors or with votes weighted in a particular way...

.
Presidents in countries with a democratic/repr form of government are traditionally president for a specified period of time and may be re-elected or removed through the same process by which they are appointed, i.e., in many nations, periodic popular elections.
Timeline

1821    The Republic of Gran Colombia (a federation covering much of present day Venezuela, Colombia, Panama, and Ecuador) is established, with Simón Bolívar as the founding President and Francisco de Paula Santander as vice president. thumb|right|220px|[[Brazil]] declares independence.

1832    President Andrew Jackson writes to Vice President Martin Van Buren expressing his opposition to South Carolina's defiance of federal authority in the Nullification Crisis.

1833    U.S. President Andrew Jackson becomes the first President to ride on a train.

1886    U.S. President Grover Cleveland marries Frances Folsom in the White House, becoming the only president to wed in the executive mansion.

1901    President Theodore Roosevelt officially renames the "Executive Mansion" to the White House.

1934    Adolf Hitler becomes the supreme leader of Germany by joining the offices of President and Chancellor into ''Führer''.

1935    The National Labor Relations Act, which governs labor relations in the United States, is signed into law by President Franklin D. Roosevelt.

1946    Ho Chi Minh is elected the President of North Vietnam.

1949    Point Four Program a program for economic aid to poor countries announced by United States President Harry S. Truman in his inaugural address for a full term as President.

1950    President Harry Truman orders the US Army to seize control of the nation's railroads to avert a strike.

 
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