1800 The Library of Congress was established with a $5,000 allocation.
1805 The U.S. Marines attacked and captured the town of Derna in Tripoli.
1877 Russia declared war on the Ottoman Empire.
1898 Spain declared war on the U.S., rejecting America's ultimatum for Spain to withdraw from Cuba.
1915 The mass deportation of Armenians by Turks began during World War I.
1916 Irish nationalists launched the Easter Rebellion against British occupation forces. They were overtaken several days later.
1948 The Berlin airlift began to relieve the surrounded city of Berlin.
1961 U.S. President Kennedy accepted "sole responsibility" following the Bay of Pigs invasion of Cuba.
1967 Soviet astronaut Vladimir Komarov died when his craft crashed with a tangled parachute.
1970 The People's Republic of China launched its first satellite.
1981 The IBM Personal Computer was introduced.
1990 The space shuttle Discovery blasted off from Cape Canaveral, Fla. It was carrying the $1.5 billion Hubble Space Telescope.
1997 The U.S. Senate ratified the Chemical Weapons Convention. The global treaty banned the development, production, storage and use of chemical weapons
2003 2003 - A U.S. official reported the North Korea had claimed to have nuclear weapons.