The United States and the Soviet Union became rivals after World War II because
A. the Soviet Union began developing nuclear weapons.
B. the Marshall Plan failed to rebuild war-torn Europe.
C. Communists and Western capitalists distrusted each other.
D. the United States threatened to invade Soviet satellite states.

The Truman Doctrine promised to
A. restore control of satellite states to the Soviet Union.
B. use military force to fight Communist expansion in Asia.
C. give economic aid to countries threatened by communism.
D. end the civil war in Greece and rid the country of Communists.

The Marshall Plan was based on the idea that
A. North and South Korea should be unified.
B. military force was the best way to contain communism.
C. nations should maintain large arsenals of nuclear weapons.
D. communism succeeded only in countries with economic problems.

The Berlin Wall was erected in order to
A. stop the flow of refugees from East Germany.
B. prevent the spread of communism.
C. protect Soviet military supplies.
D. retaliate against U. S. aggression.