Chamizal dispute
（重定向自Chamizal）
![Map of the Chamizal Settlement of 1963](/Images/godic/202501/03/Chazimal_dispute_map_014943.jpg")
![U.S. Ambassador to Mexico, Thomas C. Mann (left) and the Mexican Secretary of Foreign Affairs, Manuel Tello Baurraud (right) sign the Chamizal Convention in Mexico City on 29 August 1963.](/Images/godic/202501/03/Chamizal_convention_1963_Mann_Tello4944.jpg")
![U.S. President Lyndon B. Johnson (left) and Mexican President Adolfo López Mateos (right) unveil the new boundary marker signaling the peaceful end of the Chamizal dispute on 25 September 1964.](/Images/godic/202501/03/Johnson_Lopez_Mateos_Chamizal_1964-09-254944.jpg")
The Chamizal dispute was a border conflict over about 600 acres (2.4 km) on the U.S.-Mexico border between El Paso, Texas, and Ciudad Juárez, Chihuahua. It was caused by a shift in the Rio Grande, as a survey presented in 1852 marked differences between the bed of the Rio Grande (in Spanish:Río Bravo del Norte) and the present channel of the river. The Chamizal was once the only link between El Paso and Ciudad Juárez and tensions over the territory during the historic Taft-Diaz summit almost resulted in the attempted assassination of both presidents on October 16, 1909.