1802 – The Army Corps of Engineers is established to found and operate the United States Military Academy at West Point.
1916 – The 7th and 10th US cavalry regiments under John J. Pershing cross the US-Mexico border to join the hunt for Pancho Villa.
1935 – Adolf Hitler orders Germany to rearm in violation of the Treaty of Versailles. Conscription is reintroduced to form the Wehrmacht.
1958 – The Ford Motor Company produces its 50 millionth automobile, the Thunderbird, averaging almost a million cars a year since the company’s founding.
1969 – My Lai Massacre occurs: between 347 and 500 Vietnamese villagers are killed by American troops.
1988 – Iran-Contra Affair: Lieutenant Colonel Oliver North and Vice Admiral John Poindexter are indicted on charges of conspiracy to defraud the United States.
1995 – Mississippi formally ratifies the Thirteenth Amendment, becoming the last state to approve the abolition of slavery. The Thirteenth Amendment was officially ratified in 1865.