December 22nd

Don't ask don't tell was repealed. President Obama signed the repeal of the don't ask, don't tell policy that governed the recruitment and service of LGBTQ members in the United States military. The policy was put in place by the Clinton Administration in 1994.
Don't Ask, Don't Tell Repeal Act of 2010
Hamid Karzai sworn in as president of Afghanistan.
Hamid Karzai
Lech Wałęsa sworn in as Poland's 1st popularly elected president.
President of Poland
Romanian President Nicolae Ceaușescu overthrown. The Communist President was ousted after widespread demonstrations in the country. Ceaușescu and his wife Elena tried to flee the country, but were captured, tried and executed by a firing squad. The Romanian Revolution was the only violent overthrow of a communist government in the 1980s.
Nicolae Ceaușescu
Lincoln Tunnel opens. The 1.5-mile-long (2.4 km) long tunnel passes under the Hudson River and connects New Jersey to New York City.
Lincoln Tunnel
French army officer Capt. Alfred Dreyfus was convicted of treason in a court-martial.
Alfred Dreyfus
First asteroid discovered through astrophotography. 323 Brucia was discovered by Max Wolf and was named after Catherine Wolfe Bruce, an American patron of astronomy.
323 Brucia
Itō Hirobumi, a samurai, becomes the first Prime Minister of Japan.
Itō Hirobumi
First Christmas tree to be illuminated by electric lights displayed. Edward H. Johnson, an associate of inventor Thomas Edison and the Vice President of the Edison Electric Light Company, became the first person to decorate a Christmas tree with electric lights at his home in New York City.
Christmas lights
During the Civil War, Union general William T. Sherman sent a message to President Lincoln saying, "I beg to present you as a Christmas gift the city of Savannah.".
William Tecumseh Sherman
The execution of Russian writer Fyodor Dostoevsky is called off at the last second.
Fyodor Dostoyevsky
The U.S. Congress passed the Embargo Act.
Embargo Act of 1807
Supposedly impenetrable Turkish fortress of Izmail stormed and captured by Suvorov and his Russian armies during the Russo-Turkish War (1787–92).
Construction of the first schoolhouse west of the Allegheny Mountains was started in Schoenbrunn, Ohio, by Moravian missionaries.
Tuscarawas County, Ohio