Some historians have argued that the development of the policy of containment after the Second World War marked a turning point in United States foreign policy. Support, modify, or refute this contention using specific evidence.

-adopted policy to halt the expansion of communist influence
-after WWII, U. S. obtained a role as a global leader
-created by George Kennan
-primary U. S. foreign policy from Truman Doctrine (1947) to fall of Berlin Wall (1989)
-involvement in Vietnam grew out of commitments and assumptions of containment
-Effects of containment
~As a global leader, U. S. abandons former policy of isolationism
~involvement in many more foreign entanglements (i. e. Korea, Vietnam, Iraq.