Why was Solidarity successful?, Why was Czechoslovakia invaded in 1968?, Why were Gorbachev’s reforms important for Eastern Europe?, Why was the Berlin Wall built in 1961?, Why did the USSR want to stop Ducek’s reforms?, Why did the USSR invade Hungary in 1956?, Why did Germans dislike the Berlin Wall?, Why did Gorbachev do little to defend Soviet control over Eastern Europe?, Why was Berlin a focus of Cold War tension up to 1961?.

6 Markers - How secure was Soviet control of Eastern Europe?

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