After World War I and the dissolution of Austria-Hungary, the state of Czechoslovakia was established. The first Slovak Republic existed during World War II as a partially-recognized client state of Nazi Germany. At the end of World War II, Czechoslovakia was re-established as an independent country. After a coup in 1948, Czechoslovakia came under communist administration, and became a part of the Soviet-led Eastern Bloc. Attempts to liberalize communism in Czechoslovakia culminated in the Prague Spring, which was crushed by the Warsaw Pact invasion of Czechoslovakia in August 1968. In 1989, the Velvet Revolution peacefully ended the Communist rule in Czechoslovakia. Slovakia became an independent state on 1 January 1993 after the peaceful dissolution of Czechoslovakia, sometimes known as the Velvet Divorce.