American foreign policy switched gears following World War I, changing from one of expansionism to one of .
1.Dollar diplomacy
2.isolationism
3.Imperialism

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The correct answer is 2. Isolationism

Following world war 1, United States didn't want to mess with European affairs because they understood how bad the war was and didn't want to participate in it again. That's why when Wilson wanted to join the League of Nations they declined and the US remained on its own.
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