Final answer:
The Treaty of Versailles that ended World War I was rejected by the US Senate, leading to significant consequences for Germany and the League of Nations.
Explanation:
The Treaty of Versailles ended World War I officially, but the U.S. Senate rejected its provisions, resulting in the treaty failing to be ratified.
President Wilson's efforts to shape the treaty were hindered by the Senate's rejection, leading to the U.S. not joining the League of Nations.
Germany faced harsh conditions in the treaty, including losing territories, disarmament, and being blamed for the war, causing bitterness among Germans.
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