the United States' policy of containment after World War II was intended to prevent communism from spreading beyond

Beyond Europe.

Explanation:

Containment of the Soviet Union and communism was going to be a doctrine guiding global US diplomacy, not only foreign policy toward Europe, though Europe was one of the main confrontation teathers of the Cold War. The doctrine concerned all the continents and it would make use of all means available to stop the expansion of communism worldwide: diplomatic, military and economic.