![]() INTERNATIONAL BOUNDARY AND WATER COMMISSION Presidents Kennedy and López Mateos directed their governments to solve the Chamizal problem. After negotiating the details for over a year, US Ambassador Thomas C. Mann and Mexico’s Foreign Secretary Manuel Tello, signed the Chamizal Convention on August 29, 1963. The treaty built on a century of diplomatic efforts to resolve the dispute. ![]() NPS ![]() U.S. DEPARTMENT OF STATE
—Frank V. Ortiz, Jr., Special Assistant to US Ambassador Thomas C. Mann
—Thomas C. Mann, US Ambassador to Mexico The NegotiatorsThese men are identified as key negotiators of the Chamizal Convention in the U.S. Department of State publication Hands Across the Border: The Story of Chamizal, October, 1967. ![]() Thomas C. MannUS Ambassador to Mexico![]() Manuel TelloMexican Secretary for Foreign Relations![]() Robert M. SayreUS Director of Mexican Affairs![]() J.F. FriedkinUS Commissioner, IBWC![]() David Herrera JordanMexican Commissioner, IBWC![]() Frank V. Ortiz, Jr.Special Assistant to Ambassador Mann
![]() Vicente Sanchez GavitoMexican Ambassador to the OAS![]() Frederick Smith, Jr.Legal Counsel![]() T.R. MartinSpecial Assistant for Boundary and Water Affairs |
Last updated: October 20, 2020