1790 - The first session of the U.S. Supreme Court was held in New York City.

1790 - Benjamin Franklin advocated for an end to slavery with his Petition from the Pennsylvania Society for the Abolition of Slavery.
1870 - Passing of the 15th Amendment, granting suffrage to African Americans.

1787 - End of Shays's Rebellion.
1945 - Yalta Conference between Churchill, Roosevelt, and Stalin (during World War II).
1948 - Ceylon (Sri Lanka) became independent.

1917 - Immigration Act was passed by Congress.

1788 - Massachusetts officially became a U.S. state.
1933 - 20th Amendment, regarding the date of presidential inaugurations, went into effect.

1795 - Ratification of the 11th Amendment.
1926 - Negro History Week was founded by Carter G. Woodson.
1971 - Suffrage was granted to women in Switzerland.
1974 - Grenada became independent.

1587 - Beheading of Mary Queen of Scots.
1870 - Establishment of the National Weather Service (NWS).
1904 - Start of the Russo-Japanese War.

1964 - The Beatles appeared on the Ed Sullivan Show for the first time.

1763 - French and Indian War (also known as the Seven Years' War) ended with the signing of the Treaty of Paris.
1967 - Ratification of the 25th Amendment.

1805 - Birth of Sacajawea's son, Jean Baptiste.
1858 - Marie-Bernarde Soubirous (Saint Bernadette of Lourdes) saw her first vision of the Virgin Mary.

1554 - Execution of England's Lady Jane Grey.
1818 - Chile became independent.
1909 - Founding of the National Association for the Advancement of Colored People (NAACP).

1960 - France detonated an atomic bomb.

Valentine's Day

1859 - Oregon became a U.S. state.
1912 - Arizona became a U.S. state.
1920 - Founding of the League of Women Voters.

1764 - Founding of St. Louis, Missouri.
1898 - Explosion of the U.S.S. Maine off the coast of Cuba.

1923 - Opening of Pharaoh Tutankhamen's tomb in Egypt's Valley of the Kings by archaeologist Howard Carter.

1600 - Giordano Bruno was burned at the stake for heresy by the Inquisition.

1674 - Peace of Westminster signed and New Amsterdam became New York.
1878 - Patent granted to Thomas Alva Edison for the gramophone (phonograph).

1792 - Post Office Department signed into law by U.S. President George Washington.
1962 - John Glenn orbited the earth.

1613 - Election of Mikhail (Michael) Romanov as tsar of Russia.  The Romanov dynasty ruled Russia until the Russian Revolution of 1917.
1916 - Start of the Battle of Verdun (World War I).
1965 - Assassination of African-American civil rights activist Malcolm X.

1836 - Siege of the Alamo, in Texas, was begun by General Santa Anna of Mexico.
1945 - The United States flag was raised on Iwo Jima by the Marines.

1582 - The Gregorian calendar was introduced by Pope Gregory XIII.
1821 - Mexico became independent.
1920 - Nazi Hofbrauhaus in Munich, Germany.

1570 - Excommunication of England's Elizabeth I.
1901 - U.S. Steel Corporation formed by J. Pierpont Morgan.

1815 - French Emperor Napoleon Bonaparte escaped from Elba and began his 100 Days.
1919 - Establishment of Grand Canyon National Park.
1993 - World Trade Center bombing.

1844 - The Dominican Republic became independent.
1933 - Reichstag fire in Berlin, Germany.
1951 - Ratification of the 22nd Amendment to the United States Constitution.
1973 - Wounded Knee occupation by the American Indian Movement.

1784 - The Methodist Church was formally established by John Wesley.

Leap Day (every four years) - 2012, 2016, 2020, 2024, 2028, 2032, etc.