It is the 56th day of the year, with only 309 days remaining until the new year.
138 - The Emperor Hadrian adopts Antoninus Pius, effectively making him his successor.
1836 - Samuel Colt is granted a United States patent for the Colt revolver.
1866 - Mines in Calaveras County, California, discover what is now called the Calaveras Skull, human remains that supposedly indicated that man, mastodons, and elephants had co-existed.
1870 - Hiram Rhodes Revels, a Republican from Mississippi, is sworn into the United States Senate, becoming the first African-American ever to sit in the U.S. Congress.
1901 - J. P. Morgan incorporates the United States Steel Corporation.
1932 - Adolf Hitler obtains German citizenship by naturalization, which allows him to run in the 1932 election for Reichsprasident.
1933 - The USS Ranger is launched. it is the first U.S. Navy ship to be built solely as an aircraft carrier.
1964 - Muhammad Ali, then Cassius Clay, beats Sonny Liston in the world heavyweight boxing title fight. This is Ali's 20th pro boxing fight and first heavyweight title.
1968 - 135 unarmed citizens of Ha My village in South Vietnam's Quang Nam Province are killed and buried en masse by South Korean troops in a massacre.