December 12 is the 346th day of the year. There are 19 days remaining until the end of the year.
- 1745 – John Jay, first Chief Justice of the US Supreme Court, was born. He died in 1829.
- 1787 – Pennsylvania became the second state to ratify the US Constitution.
- 1941 – Adolf Hitler announced extermination of the Jews at a meeting in the Reich Chancellery.
- 1944 - Regina Jonas, first woman Rabbi, died in Auschwitz. She was born in 1902.
December 13 is the 347th day of the year. There are 18 days remaining until the end of the year.
- 1636 - The United States National Guard was founded by MA Bay Colony.
- 1769 – Dartmouth College was founded.
- 1818 – Mary Todd Lincoln, First Lady of the United States, was born. She died in 1882.
- 1938 – The Neuengamme concentration camp opened in Hamburg, Germany.
- 1961 – Grandma Moses, American painter, died. She was born in 1860.
- 2006 – The Baiji, or Chinese River Dolphin, was declared extinct.
December 14 is the 348th day of the year. There are 17 days remaining until the end of the year.
- 1799 – George Washington, first President of the United States, died. He was born in 1732.
- 1819 – Alabama became the 22nd US state.
- 1943 – John Harvey Kellogg, American breakfast food manufacturer, died. He was born in 1852.
- 1946 – The United Nations General Assembly voted to establish its headquarters in New York City.
- 1962 – NASA’s Mariner 2 became the first spacecraft to fly by Venus.
- 1964 – In Heart of Atlanta Motel v. United States, the US Supreme Court ruled that Congress can use the Constitution’s Commerce Clause power to fight discrimination.
- 1972 – Eugene Cernan became the last person to walk on the moon in the 20th century.
- 1994 – Construction began on the Three Gorges Dam, the world’s largest power station, located on the Yangtze River.
December 15 is the 349th day of the year. There are 16 days remaining until the end of the year.
- 1791 – The US Bill of Rights became law when ratified by Virginia.
- 1939 – Gone with the Wind premièred in Atlanta, Georgia.
- 1945 – General Douglas MacArthur ordered that Shinto be abolished as the state religion of Japan
- 1973 – The American Psychiatric Association voted 13–0 to remove homosexuality from its official list of psychiatric disorders, the DSM-II.
- 1978 – US President Jimmy Carter announced that the US would recognize the People’s Republic of China.
December 16 is the 350th day of the year. There are 15 days remaining until the end of the year.
- 1707 – The last recorded eruption of Mount Fuji in Japan occurred.
- 1773 – The Sons of Liberty dumped crates of tea into Boston Harbor as a protest against the Tea Act.
- 1775 – Jane Austen, English author of Sense and Sensibility (1811), was born. She died in 1817.
- 1917 – Sir Arthur C. Clarke, English author of 2001: A Space Odyssey, was born. He died in 2008.
December 17 is the 351st day of the year. There are 14 days remaining until the end of the year.
December 17 is International Day to End Violence Against Sex Workers (United States).
December 17 is Wright Brothers Day, a US federal observance by Presidential proclamation.
- 1790 – Discovery of the 24-ton Aztec calendar stone in Mexico City.
- 1862 – General Ulysses S. Grant issued General Order No. 11 expelling Jews from Tennessee, Mississippi, and Kentucky to curb the black market that he thought the Jews must be responsible for. It was revoked by President Lincoln.
- 1903 - The Wright Brothers made their first powered and heavier-than-air flight in the Wright Flyer in Kitty Hawk, North Carolina.
- 1997 – The United Kingdom passed its Firearms (Amendment) (No. 2) Act 1997, which extends the state's gun ban to include all handguns, except antique and show weapons.
December 18 is the 352nd day of the year. There are 13 days remaining until the end of the year.
December 18 is International Migrants Day.
- 1620 – The Mayflower landed in Plymouth, Massachusetts with 102 pilgrims on board.
- 1787 – New Jersey became the third US state.
- 1888 – Richard Wetherill discovered the ancient Indian ruins of Cliff Palace in Mesa Verde, Colorado.
- 1918 – The U.S. House of Representatives approved the 18th Amendment and Prohibition.
- 1958 – The US launched the world's first communications satellite.
- 1971 – Capitol Reef National Park was established in Utah.