WHAT HAPPENED ON 13. APRIL
Want to find out what all happened on 13. April

A Pact of neutrality between the USSR and Japan is signed. (13. April 1941)

World War II: The discovery of mass graves of Polish prisoners of war killed by Soviet forces in the Katyń Forest Massacre is announced, causing a diplomatic rift between the Polish government in exile in London from the Soviet Union, which denies responsibility. (13. April 1943)

The Jefferson Memorial is dedicated in Washington, D.C., on the 200th anniversary of President Thomas Jefferson's birth. (13. April 1943)

Diplomatic relations between New Zealand and the Soviet Union are established. (13. April 1944)

World War II: German troops kill more than 1,000 political and military prisoners in Gardelegen, Germany. (13. April 1945)

World War II: Soviet and Bulgarian forces capture Vienna, Austria. (13. April 1945)

The Hadassah medical convoy massacre: In an ambush, 79 Jewish doctors, nurses and medical students from Hadassah Hospital and a British soldier are massacred by Arabs in Sheikh Jarra near Jerusalem. (13. April 1948)

CIA director Allen Dulles launches the mind-control program MKULTRA. (13. April 1953)

Cold War: American Van Cliburn wins the inaugural International Tchaikovsky Competition in Moscow. (13. April 1958)

The United States launches Transit 1-B, the world's first satellite navigation system. (13. April 1960)

At the Academy Awards, Sidney Poitier becomes the first African-American male to win the Best Actor award for the 1963 film Lilies of the Field. (13. April 1964)

An oxygen tank aboard Apollo 13 explodes, putting the crew in great danger and causing major damage to the spacecraft while en route to the Moon. (13. April 1970)

The Universal Postal Union decides to recognize the People's Republic of China as the only legitimate Chinese representative, effectively expelling the Republic of China administering Taiwan. (13. April 1972)

Vietnam War: The Battle of An Lộc begins. (13. April 1972)

Western Union (in cooperation with NASA and Hughes Aircraft) launches the United States' first commercial geosynchronous communications satellite, Westar 1. (13. April 1974)

Bus massacre in Lebanon: An attack by the Phalangist resistance kills 26 militia members of the Popular Front for the Liberation of Palestine, marking the start of the 15-year Lebanese Civil War. (13. April 1975)

The United States Treasury Department reintroduces the two-dollar bill as a Federal Reserve Note on Thomas Jefferson's 233rd birthday as part of the United States Bicentennial celebration. (13. April 1976)

India moves into Siachen Glacier thus annexing more territory from the Line of Control. (13. April 1984)

Portugal and the People's Republic of China sign an agreement in which Macau would be returned to China in 1999. (13. April 1987)

The Great Chicago flood devastates much of central Chicago. (13. April 1992)