Which of the following was a manifestation of American isolationism?

Question

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The failure of the United States to join the League of Nations was a clear manifestation of American isolationism. The U.S. Senate rejected the Treaty of Versailles, which included provisions for the establishment of the League, on the grounds that the organization would interfere with American sovereignty and independence. This led to a period of American unilateralism in foreign policy, in which the U.S. sought to avoid involvement in international conflicts and alliances.

Which of the Following Was a Manifestation of American Isolationism