1679 New Hampshire becomes a county of the Massachusetts Bay Colony.
1788 New Hampshire ratifies the Constitution of the United States and is admitted as the 9th state in the United States.
1804 New Hampshire approves the Twelfth Amendment to the United States Constitution, ratifying the document.
1905 Russo-Japanese War: In New Hampshire, USA, the Treaty of Portsmouth, mediated by US President Theodore Roosevelt, ends the war.
1934 The strongest surface wind gust in the world at 231 mph, is measured on the summit of Mount Washington, New Hampshire.
1939 The U.S. Navy submarine USS ''Squalus'' sinks off the coast of New Hampshire during a test dive, causing the death of 24 sailors and two civilian technicians. The remaining 32 sailors and one civilian naval architect are rescued the following day.
1964 New Hampshire Lottery: New Hampshire becomes the first U.S. state to legally sell lottery tickets in the 20th century.
2003 New Hampshire's famous Old Man of the Mountain collapses.