Final answer:
Post World War I, the majority of Americans adopted a policy of isolationism, limiting foreign alliances and avoiding involvement in foreign conflicts. This was demonstrated when the U.S. Senate rejected the Treaty of Versailles and America's entry into the League of Nations.
Step-by-step explanation:
Immediately following World War I, most Americans embraced the policy of isolationism. This was a diplomatic policy where a nation seeks to limit its alliances and avoid involvement in foreign conflicts. It is driven by the belief that focusing on domestic affairs can better serve national interests and means preserving peace through avoiding foreign entanglements. This policy of isolationism was exemplified when the U.S. Senate rejected the Treaty of Versailles and America's entry into the League of Nations, both meant to preserve international peace post WWI.
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