How secure was the USSR's control of Eastern Europe?

How secure was the USSR's control of Eastern Europe?

1. Why was there opposition to Soviet control in Hungary (1956) and Czechoslovakia (1968) and how did the USSR react to this opposition?

   • Resistance to Soviet power in Hungary and Czechoslovakia

2. Why was the Berlin Wall built in 1961?

   • The Berlin Wall

3. What was the significance of 'Solidarity' in Poland for the decline of Soviet influence in Eastern Europe?

   • 'Solidarity' in Poland

4. How far was Gorbachev personally responsible for the collapse of Soviet control over Eastern Europe?

   • Gorbachev and the collapse of the Soviet Empire