What major event led to a long-term shift in U.S. foreign policy from isolationism to global engagement?

Question

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World War II marked a significant shift in U.S. foreign policy as the country emerged as a superpower and began engaging more actively in global affairs. The devastation of the war and the emergence of the Soviet Union as a rival superpower led to the development of the containment policy aimed at preventing the spread of communism. This led to increased involvement in international institutions such as the United Nations and NATO, and a commitment to promoting democracy and freedom around the world.

What Major Event Led to a Long-Term Shift in U