Final answer:
Most Americans embraced isolationism after WWI due to a desire for peace and self-determination, solidified by the U.S. refusal to join the League of Nations.
Explanation:
Isolationism was the policy that most Americans embraced immediately following WWI. President Wilson's Fourteen Points emphasized self-determination of peoples, showing a desire for peace and avoiding international entanglements. This preference for isolationism was further solidified by the U.S. refusal to join the League of Nations and the adoption of a neutrality policy in the 1930s.
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