1775 The American Revolution began as fighting broke out in Lexington, Massachusetts.
1802 The Spanish reopened the New Orleans port to American merchants.
1861 The Baltimore riots resulted in four Union soldiers and nine civilians killed.
1861 U.S. President Lincoln ordered a blockade of Confederate ports.
1927 In China, Hankow communists declared war on Chaing Kai-shek.
1933 The U.S. went off the gold standard.
1939 Connecticut approved the Bill of Rights for the U.S. Constitution after 148 years.
1951 General Douglas MacArthur gave his "Old Soldiers" speech before the U.S. Congress. In the address General MacArthur said that "Old soldiers never die, they just fade away."
1956 Actress Grace Kelly became Princess Grace of Monaco when she married Prince Rainier III of Monaco.
1967 Surveyor 3 landed on the moon and began sending photos back to the U.S.
1971 Russia launched its first Salyut space station.
1989 A giant asteroid passed within 500,000 miles of Earth.
1989 A gun turret exploded aboard the USS Iowa. 47 sailors were killed.
1993 The Branch-Davidianís compound in Waco, TX, burned to the ground. It was the end of a 51-day standoff between the cult and U.S. federal agents. 86 people were killed including 17 children. 9 Branch Davidians escaped.
1995 The Alfred P. Murrah Federal Building in Oklahoma City, OK, was destroyed by a car-bomb. It was the worst bombing on U.S. territory. 168 people were killed including 19 children, and 500 were injured. Timothy McVeigh was found guilty of the bombing on June 2, 1997.
1998 Wang Dan, a leader of 1989 Tienanmen Square pro democracy protests, was freed by the Chinese government.
2000 The Oklahoma City National Memorial was dedicated on the fifth anniversary of the bombing in Oklahoma that killed 168 people.
2002 The USS Cole was relaunched. In Yemen, 17 sailors were killed when the ship was attacked by terrorists on October 12, 2000. The attack was blamed on Osama bin Laden's al-Qaida network.