Final answer:
Americans opposed joining the League of Nations due to isolationist beliefs and concerns about sovereignty. The League's effectiveness was hampered by the absence of the most powerful nation in the world.
Step-by-step explanation:
Americans were opposed to joining the League of Nations for a few reasons. One key factor was the principle of isolationism, which was the belief that the United States should stay out of foreign affairs. Many Americans feared that involvement in the League of Nations would drag the country into future conflicts. Additionally, there were concerns about the loss of sovereignty and the potential for compromising American interests.
For the League of Nations, the non-participation of the most powerful nation in the world had significant implications. The absence of the United States limited the League's effectiveness and undermined its ability to achieve global cooperation. Without American participation, the League faced challenges in resolving conflicts and maintaining collective security.
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