1981 – Xerox PARC introduces the computer mouse

1974 – Ten thousand march in Washington, DC, calling for the impeachment of US President Richard Nixon

1986 – A nuclear reactor accident occurs at the Chernobyl Nuclear Power Plant in the Soviet Union (now Ukraine ), cre…

1607 – English colonists make landfall at Cape Henry , Virginia

1901 – New York becomes the first US state to require automobile license plates

1898 – Spanish–American War : The United States declares war on Spain

1792 – " La Marseillaise " (the French national anthem ) is composed by Claude Joseph Rouget de Lisle

1644 – The Chongzhen Emperor , the last Emperor of Ming dynasty China, commits suicide during a peasant rebellion led…

404 BC – Peloponnesian War : Lysander 's Spartan armies defeated the Athenians and the war ends

2005 – Snuppy becomes world's first cloned dog.

1990 - STS-31 : The Hubble Space Telescope is launched from the space shuttle Discovery .

1970 – The first Chinese satellite , Dong Fang Hong I , is launched

1967 – Cosmonaut Vladimir Komarov dies in Soyuz 1 when its parachute fails to open He is the first human to die during …

1953 – Winston Churchill is knighted by Queen Elizabeth II

1926 – The Treaty of Berlin is signed Germany and the Soviet Union each pledge neutrality in the event of an attack on …

1918 – First tank-to-tank combat, at Villers-Bretonneux , France, when three British Mark IVs meet three German A7Vs

1895 – Joshua Slocum , the first person to sail single-handedly around the world, sets sail from Boston, Massachusetts …

1877 – Russo-Turkish War : Russian Empire declares war on Ottoman Empire

1800 – The United States Library of Congress is established when President John Adams signs legislation to appropriate …

1184 BC - Trojan fall   At night, when everyone was asleep , the Greek soldiers , who hid inside the wooden …