What happened on the night of 20 to 21 August 1968?

Answer and explanation

Correct answer: A. Troops of the Warsaw Pact invaded Czechoslovakia and ended the Prague Spring

  1. Step 1: The reform movement ended in August. Step 2. The invasion ended it. Answer: the invasion by the Warsaw Pact. Why not the others: The liberation of Prague in 1945, the occupation of Wenceslas Square and the resignation call are different events.

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