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In 1904 the Senate approved for ratification a treaty with the new Republic of Panama giving the United States control of the Canal Zone in perpetuity. Secretary of State John Hay negotiated the treaty with Philippe Bunau-Varilla, a French engineer representing Panama. In 1978 the Senate approved for ratification two treaties transferring the canal to Panama in 1999.
General Records of the U.S. Government, National Archives and Records Administration