because the other world leaders had other plans, they had a war.
It was because of the war.
Republican Isolationists opposed the ratification of President Wilson's League of Nations due to concerns about U.S. sovereignty, Wilson's unilateral approach in negotiations, a prevailing desire for isolationism, and distrust towards European allies. This opposition led to the treaty's failure in the Senate, preventing the U.S. from joining the League. The result was that the League of Nations effectively lost significant power and credibility without American support.
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