Answer:
The Soviet Union played a crucial role to the spread of communism around the world.
Step-by-step explanation:
In Europe, the Soviet Union occupied most of the countries in Eastern Europe after World War II. Countries such as Poland, Czechoslovakia and Hungary were given independence by the Soviet Union only in name, because their governments had to be communist and pro-Soviet.
In Asia, the Soviet Union supported North Korea during the Korean War, and aided the VietCong. It also invaded Afghanistan with the aim of spreading communism there.
In Africa, the Soviet Union was very active, arming dozens of communist militias in several countries (Angola, Rhodesia, Uganda, Ethiopia).
In Latin America, the Soviet Union supported Cuba until its fall in 1991. It also gave military support to dozens of guerrillas in practically every Latin American country.