Morocco: King and People’s Revolution Day Hungary: Foundation Day / St. Stephens's Day Estonia: Day of Restoration of Independence
1000 - The foundation of the Hungarian state, Hungary is established as a Christian kingdom by Stephen I of Hungary.
1391 - Konrad von Wallenrode becomes the 24th Hochmeister of the Teutonic Order.
1672 - Former Grand Pensionary Johan de Witt and his brother Cornelis are brutally murdered by an angry mob in The Hague.
1775 - The Spanish establish a presidio (fort) in the town that became Tucson, Arizona.
1794 - Battle of Fallen Timbers – American troops force a confederacy of Shawnee, Mingo, Delaware, Wyandot, Miami, Ottawa, Chippewa, and Potawatomi warriors into a disorganized retreat.
1804 - Lewis and Clark Expedition: the "Corps of Discovery", exploring the Louisiana Purchase, suffers its only death when sergeant Charles Floyd dies, apparently from acute appendicitis.
1858 - Charles Darwin first publishes his theory of evolution in The Journal of the Proceedings of the Linnean Society of London, alongside Alfred Russel Wallace's same theory.
1866 - President Andrew Johnson formally declares the American Civil War over.
1882 - Peter Ilyich Tchaikovsky's 1812 Overture debuts in Moscow.
1888 - Mutineers imprison Emin Pasha at Dufile.
1900 - Japan's primary school law is amended to provide for four years of mandatory schooling.
1914 - World War I: German forces occupy Brussels.
1920 - The first commercial radio station, 8MK (WWJ), begins operations in Detroit, Michigan.
1926 - Japan's public broadcasting company, Nippon Hōsō Kyōkai(NHK) is established.
1938 - Lou Gehrig hits his 23rd career grand slam – a record that still stands.
1940 - In Mexico City exiled Russian revolutionary Leon Trotsky is fatally wounded with an ice axe by Ramon Mercader. He dies the next day.
1944 - World War II: the Battle of Romania begins with a major Soviet offensive.
1953 - The Soviet Union publicly acknowledges that it had tested a hydrogen bomb.
1955 - In Morocco, a force of Berbers from the Atlas Mountains region of Algeria raid two rural settlements and kill 77 French nationals.
1960 - Senegal breaks from the Mali federation, declaring its independence.
1968 - 200,000 Warsaw Pact troops and 5,000 tanks invade Czechoslovakia to end the "Prague Spring" of political liberalization.
1975 - Viking Program: NASA launches the Viking 1 planetary probe toward Mars.
1977 - Voyager Program: NASA launches the Voyager 2 spacecraft.
1979 - The East Coast Main Line rail route between England and Scotland is restored when the Penmanshiel Diversion opens.
1982 - Lebanese Civil War: a multinational force lands in Beirut to oversee the PLO's withdrawal from Lebanon.
1986 - In Edmond, Oklahoma, U.S. Postal employee Patrick Sherrill guns down 14 of his co-workers and then commits suicide.
1988 - "Black Saturday" of the Yellowstone fire in Yellowstone National Park
1988 - Peru becomes a member of the Berne Convention copyright treaty.
1988 - Iran–Iraq War: a cease-fire is agreed after almost eight years of war.
1991 - Collapse of the Soviet Union, August Coup: more than 100,000 people rally outside the Soviet Union's parliament building protesting the coup aiming to depose President Mikhail Gorbachev.
1991 - Estonia secedes from the Soviet Union.
1993 - After rounds of secret negotiations in Norway, the Oslo Peace Accords are signed, followed by a public ceremony in Washington, D.C. the following month.
1997 - Souhane massacre in Algeria; over 60 people are killed and 15 kidnapped.
1998 - The Supreme Court of Canada rules that Quebec cannot legally secede from Canada without the federal government's approval.
1998 - U.S. embassy bombings: the United States military launches cruise missile attacks against alleged al-Qaida camps in Afghanistan and a suspected chemical plant in Sudan in retaliation for the August 7 bombings of American embassies in Kenya and Tanzania. The al-Shifa pharmaceutical factory in Khartoum is destroyed in the attack.
2002 - A group of Iraqis opposed to the regime of Saddam Hussein take over the Iraqi Embassy in Berlin for five hours before releasing their hostages and surrendering.
2008 - Spanair Flight 5022, from Madrid to Gran Canaria, skids off the runway and crashes at Barajas Airport. 146 people are killed in the crash, 8 more die afterwards. Only 18 people survive.
2008 - Usain Bolt breaks world record for 200m race at 2008 olympics, setting a new time of 19.30.