Answer:
In Europe, the United States developed and accomplished an economic recovery plan for Western Europe after WWII that was highly successful, the Marshall Plan. It helped Western Europeans rebuild their economies and laid the basis for prosperity. In the late 1940s, it was feared that poverty and deprivation may help the Soviet Union spread communism.
The US also used military and diplomatic means to contain the Soviet Union´s influence. Together with its allies, it created NATO to oppose the Soviet military might that intimidated Western Europeans. It also ran an airlift when the Soviets blockaded West Berlin in 1948.
In Asia, the United States intervened militarily and diplomatically in Korea in 1950-53 to stop the North Korean invasion of the South. It saw the move as part of a well elaborated plan of Moscow to expand communism in Asia. The containment doctrine had already been adopted and it motivated the Truman administration´s response in Korea. China had fallen into communist hands in 1949; the US had supported the Nationalists of Chiang Kai-shek until the end. In the 1960s, the USA got involved in Vietnam for the same reason: to stop communist expansion.
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