1806 - The Holy Roman Empire went out of existence as Emperor Francis II abdicated.
1825 - Bolivia declared independence from Peru.
1879 - The first Australian rules football game to be played at night took place at the Melbourne Cricket Ground. The game was to promote the introduction of electricity to the city of Melbourne.
1890 - The electric chair was used for the first time when Auburn State Prison in New York executed convicted murderer William Kemmler.
1914 - Austria-Hungary declared war against Russia. Serbia declared war against Germany.
1945 - The American B-29 bomber, known as the Enola Gay, dropped the first atomic bomb on an inhabited area. The bomb named "Little Boy" was dropped over the center of Hiroshima, Japan. An estimated 140,000 people were killed.
1962 - Jamaica became an independent dominion within the British Commonwealth.
1985 - The 40th anniversary of the Hiroshima atomic bombing brought tens of thousands of Japanese and foreigners to Hiroshima.
1986 - William J. Schroeder died. He lived 620 days with the Jarvik-7 manmade heart. He was the world's longest surviving recipient of a permanent artificial heart.
1995 - Thousands of glowing lanterns were set afloat in rivers in Hiroshima, Japan, on the 50th anniversary of the first atomic bombing.
1996 - NASA announced the discovery of evidence of primitive life on Mars. The evidence came in the form of a meteorite that was found in Antarctica. The meteorite was believed to have come from Mars and contained a fossil.