Rio Grande border disputes

The Rio Grande (Río Bravo del Norte) has changed course several times in recorded history, leading to a number of border disputes, both international (involving Mexico and the United States) and between individual U.S. states:

• The Country Club Area was disputed between Texas and New Mexico. The U.S. Supreme Court ended this dispute in 1927.

• The Chamizal was a disputed parcel of land between El Paso, Texas, and Ciudad Juárez, Chihuahua. This dispute was resolved by treaty in 1963.

• The Ojinaga Cut was a disputed parcel of land between Presidio, Texas, and Ojinaga, Chihuahua. This dispute was resolved by treaty in 1970.

• The Horcon Tract was a parcel of land that included the city of Rio Rico, Texas, which was accidentally placed under Mexican administration because of an irrigation change. This issue, which was technically not a dispute since both sides were in agreement about its legal status, was resolved by treaty in 1970, but the official handover did not take place until 1977.

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