<P> After the war , the U.S. rose to become the dominant non-colonial economic power with broad influence in much of the world , with the key policies of the Marshall Plan and the Truman Doctrine . Almost immediately , however , the world witnessed division into broad two camps during the Cold War ; one side was led by the U.S. and the other by the Soviet Union , but this situation also led to the establishment of the Non-Aligned Movement . This period lasted until almost the end of the 20th century and is thought to be both an ideological and power struggle between the two superpowers . A policy of containment was adopted to limit Soviet expansion , and a series of proxy wars were fought with mixed results . In 1991 , the Soviet Union dissolved into separate nations , and the Cold War formally ended as the United States gave separate diplomatic recognition to the Russian Federation and other former Soviet states . </P>
<P> After the war , the U.S. rose to become the dominant non-colonial economic power with broad influence in much of the world , with the key policies of the Marshall Plan and the Truman Doctrine . Almost immediately , however , the world witnessed division into broad two camps during the Cold War ; one side was led by the U.S. and the other by the Soviet Union , but this situation also led to the establishment of the Non-Aligned Movement . This period lasted until almost the end of the 20th century and is thought to be both an ideological and power struggle between the two superpowers . A policy of containment was adopted to limit Soviet expansion , and a series of proxy wars were fought with mixed results . In 1991 , the Soviet Union dissolved into separate nations , and the Cold War formally ended as the United States gave separate diplomatic recognition to the Russian Federation and other former Soviet states . </P>
what idea was used to justify u.s. foreign policy during the cold war era
what idea was used to justify u.s. foreign policy during the cold war era
containment
containment