Help please , Im always second guessing .

D. Avoid involvement in problems in Europe

Explanation:

Although the League of Nations was created through the Treaty of Versailles, the United States did not join in order to avoid joining another major conflict. The American populace and senators were against any intervention in foreign conflicts. USA should only focus on their economics, this is shown during WW2 that America had only joined the war due to the Japanese Attack on Pearl Harbor. They had no interest to join before that and it was already in the midst of WW2.

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