An official website of the United States Government Here's how you know

Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Boundaries and Boundary Waters

Treaty signed at Mexico City May 4, 1978; Transmitted by the President of the United States of America to the Senate January 19, 1979 (Treaty Doc. Exec. F, 96th Congress, 1st Session); Reported favorably by the Senate Committee on Foreign Relations October 8, 1997 (Senate Executive Report No. 105-4, 105th Congress, 1st Session); Advice and consent to ratification by the Senate October 23, 1997; Ratified by the President November 5, 1997; Ratifications exchanged at Washington November 13, 1997; entered into force November 13, 1997.

Download agreement [2 MB]

U.S. Department of State

The Lessons of 1989: Freedom and Our Future