Czechoslovakia was a sovereign state in Central Europe that existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until its peaceful dissolution into the Czech Republic and Slovakia on January 1, 1993.
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Velvet Revolution: A non-violent transition of power in what was then Czechoslovakia, occurring from November 17 to December 29,1989.
Prague Spring: A period of political liberalization and mass protest in Czechoslovakia as a Communist state after World War II. It began on January 5,1968, and ended with a Soviet invasion on August 21,1968.
Soviet Union: A federal socialist state in Northern Eurasia that existed from 1922 to 1991. It was a major world power that played a key role in the events of the 20th century.