What happend on 20th August

19.08
21.08
1977

Voyager program: The United States launches the Voyager 2 spacecraft.

1975

Viking program: NASA launches the Viking 1 planetary probe toward Mars.

1968

200,000 Warsaw Pact troops and 5,000 tanks invade Czechoslovakia to end the "Prague Spring" of political liberalization.

1960

Senegal breaks from the Mali federation, declaring independence.

1955

In Morocco, a force of Berbers from the Atlas Mountains region of Algeria, raid two rural settlements and kill 77 French nationals.

1940

Exiled Russian revolutionary Leon Trotsky is fatally wounded in Mexico City by an assassin's ice-ax. He will die the next day.

1926

Japan's public broadcasting company, Nippon Hōsō Kyōkai (NHK) is established.

1920

The first commercial radio station, 8MK (WWJ), begins operations in Detroit, Michigan.

1914

World War I: German forces occupy Brussels.

1900

Japan's primary school law is amended to provide for four years of mandatory schooling.