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  1. 1 day ago · On 20–21 August 1968, the Czechoslovak Socialist Republic was jointly invaded by four Warsaw Pact countries: the Soviet Union, the Polish People's Republic, the People's Republic of Bulgaria and the Hungarian People's Republic. The invasion stopped Alexander Dubček 's Prague Spring liberalisation reforms and strengthened the authoritarian ...

    • 20-21 August 1968
    • Czechoslovak Socialist Republic
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