Final answer:
The USSR wanted to control countries in Eastern Europe after World War II to create a buffer zone, expand its influence, and ensure its own security.
Step-by-step explanation:
After World War II, the USSR wanted to control countries in Eastern Europe for several reasons. Firstly, Stalin desired to create a buffer zone against attacks from the West. By establishing communist governments in Eastern European countries, the Soviet Union could ensure their loyalty and prevent them from aligning with the capitalist nations of Western Europe. Secondly, the Soviet Union aimed to expand its influence and spread communist revolution to other countries. Lastly, the USSR wanted to secure its own internal security by eliminating potential threats from Eastern Europe.