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 Dispute was a dispute 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 ceding the land to Mexico in 1970, but the official handover did not take place until 1977.