Final answer:
The United States did not ratify the Versailles Treaty and join the League of Nations due to sovereignty concerns, fear of future conflicts, and dissatisfaction with the Treaty terms.
Explanation:
The United States failed to ratify the Versailles Treaty and join the League of Nations due to various reasons. The fear of surrendering sovereignty, concerns about being obliged to enter future conflicts, and dissatisfaction with the Treaty's terms all contributed to this decision. President Wilson's vision for the League of Nations was thwarted by political opposition and a lack of support within the U.S. government.
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