Final answer:
The USSR controlled Poland and Hungary post-World War II by establishing puppet governments and maintaining a Soviet military presence to ensure the dominance of communist ideology over democratic processes.
Step-by-step explanation:
During the post-war period, the USSR was able to control Poland and Hungary primarily by setting up puppet governments and keeping Soviet troops stationed in these countries. Despite initially promised democratic elections at the Yalta and Potsdam conferences, the Soviet Union leveraged its military presence to secure communist governments that mirrored its own system. This alignment with the Soviet Union was to create a buffer zone and increase security, as Eastern European countries were seen as a protective barrier against any future invasions from the West.
Soviet control was secured by backing communist parties in elections, silencing anti-communist opposition, and using the Red Army to ensure establishment and maintenance of these single-party states. Stalin’s goal was to expand Soviet influence while also safeguarding the USSR from possible threats. The Soviet-backed governments were characterized by totalitarian rule and suppression of democratic principles and opposition.