The battle in the Senate over the Treaty of Versailles centered around Article X,which was

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The battle in the Senate over the Treaty of Versailles centered around Article X, which gave the League of Nations the right to use collective military action to enforce its decisions. Many senators were concerned that this would lead to the United States being forced into another costly war without its consent. This was a major factor in the Senate's rejection of the treaty, leading the United States to never officially join the League of Nations.

The Battle in the Senate Over the Treaty of Versailles