Chamizal National Memorial

Chamizal National Memorial, located in El Paso, Texas, along the United States–Mexico international border, is a National Park Service site commemorating the peaceful settlement of the Chamizal boundary dispute.
The 54.90-acre memorial park serves primarily as a cultural center and contains art galleries, a theater, and an amphitheatre. A museum, which details the history of the U.S.–Mexico border, is located inside the visitor center. The park honors the peaceful resolution of the Chamizal dispute, a more than 100-year border dispute between the United States and Mexico that resulted from the natural change of course of the Rio Grande between the cities of El Paso and Ciudad Juárez, Chihuahua. This national memorial was established on part of the disputed land that was assigned to the United States according to the Chamizal Convention of 1963; a corresponding Parque Público Federal "El Chamizal" was created on the now-Mexican portion of the land.
The Chamizal Convention was negotiated by the International Boundary and Water Commission, which was established in 1889 to maintain the border, and pursuant to later treaties to allocate river waters between the two nations, and provide for flood control and water sanitation.

Wikipedia