Final answer:
The United States shifted its foreign policy after Pearl Harbor, abandoning isolationism and adopting a policy of containment during the Cold War.
Step-by-step explanation:
After the attack on Pearl Harbor, the United States underwent a significant shift in its foreign policy. It abandoned its policy of isolationism and became actively involved in World War II. Instead of staying neutral, the United States declared war on Japan and joined the Allied forces.
Furthermore, the United States adopted a policy of containment, which aimed to prevent the spread of communism during the Cold War. This policy led to various actions such as the establishment of military alliances, involvement in conflicts like the Korean War and the Vietnam War, and strategic efforts to counter Soviet influence around the world.
By shifting its foreign policy, the United States became more engaged in global affairs, taking a proactive stance to protect its interests and combat perceived threats to its security and ideology.
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