Wikipedia talk:Selected anniversaries/April 7
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- 1795 - France adopts the metre as the unit of length
- 1922 - Teapot Dome scandal: United States Secretary of the Interior leases Teapot Dome oil reserves in Wyoming.
- 1927 - First long distance public television broadcast (Washington, DC to New York City; image was of Commerce Secretary Herbert Hoover).
- 1939 - World War II: Italy invades Albania.
- 1940 - Booker T. Washington becomes the first African American to be depicted on a United States postage stamp.
- 1948 - The World Health Organization is established by the United Nations.
- 1953 - Dag Hammarskjöld is elected United Nations Secretary General.
- 1954 - President Dwight D. Eisenhower gives his"domino theory" speech during a news conference.
- 1956 - Spain relinquishes its protectorate in Morocco.
- 1963 - Yugoslavia is proclaimed to be a Socialist republic and Josip Broz Tito is named President for life.
- 1964 - IBM announces the System/360
- 1969 - The Internet's symbolic birth date: publication of RFC 1.
- 1980 - The United States severs diplomatic relations with Iran and imposes economic sanctions following the taking of American hostages on November 4, 1979.
- 1983 - During STS-6, astronauts Story Musgrave and Don Peterson perform the first space shuttle spacewalk (duration: 4 hours, 10 minutes).
- 1990 - Iran Contra Affair: John Poindexter is found guilty of five charges for his part in the scandal but the convictions were later reversed after an appeal.
- 1994 - Massacres of Tutsis begin in Kigali, Rwanda.
- 1999 - Kosovo War: Kosovo's main border crossings are closed by Serbian forces to prevent ethnic Albanians from leaving.
- 2000 - Mars Odyssey is launched.
