1789 - The first presidential election in the United States occurs. 1790 - George Washington issues the first State of the Union Address in the United States. 1863 - The Emancipation Proclamation provision takes effect. 1901 - The first great oil discovery in Texas takes place. 1934 - Alcohol prohibition in the United States ends. 1946 - In London, the first United Nations General Assembly met. 1959 - Cuban dictator Juan Batista flees, and Fidel Castro's forces enter Havana. 1986 - USSR leader Mikhael Gorbachev asked for a worldwide ban on atomic weapons.