Final answer:
Treaties in the U.S. require Senate approval by a two-thirds vote, as mandated in the Constitution.
Explanation:
Treaties in the United States require approval by a two-thirds vote of the Senate. The Constitution mandates that the President, with the advice and consent of the Senate, negotiates treaties. For instance, the Treaty of Versailles, negotiated by President Woodrow Wilson post-World War I, was rejected by the Senate, showcasing how the Senate's approval is crucial.
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