Less than three weeks later, on November 18, 1903, the Hay–Bunau-Varilla Treaty was signed between Frenchman Philippe Bunau-Varilla, who had promptly been appointed Panamanian ambassador to the United States, representing Panamanian interests, and the US Secretary of State John Hay. The treaty allowed for the construction of a canal and US sovereignty over a strip of land wide and long, (16 kilometers by 80 kilometers) on either side of the Panama Canal Zone. In that zone, the US would build a canal, then administer, fortify, and defend it "in perpetuity".