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The Senate has the constitutional power to approve or reject treaties with foreign countries. President Woodrow Wilson urged the Senate to swiftly approve the Treaty of Versailles. Instead, the Senate debated the treaty’s terms for months, with many senators expressing concerns that participation in a League of Nations might undermine U.S. sovereignty. Efforts to amend the treaty failed, however, and the Senate ultimately rejected it.
Records of the U.S. Senate, National Archives and Records Administration