The Chamizal dispute was caused by a shift in which one of the principal rivers in the southwest United States and northern Mexico?
Rio Grande The Rio Grande ( or ; Spanish: Río Bravo del Norte , ] or simply Río Bravo) is one of the principal rivers in the southwest United States and northern Mexico (the other being the Colorado River). The Rio Grande begins in south-central Colorado in the United States and flows to the Gulf of Mexico. Along the way, it forms part of the Mexico–United States border. According to the International Boundary and Water Commission, its total length was 1896 mi in the late 1980s, though course shifts occasionally result in length changes. Depending on how it is measured, the Rio Grande is either the fourth- or fifth-longest river system in North America.
Politics of the Arizona Borderlands The Arizona borderlands are the geographic and cultural region north of the Arizona portion of the US-Mexico border. The area is unique in that it features both an international border and the Tohono O'oham sovereign nation along much of that border. Frequent and persistent topics of interest in the area include the presence of illegal immigration, the confluence of local, state, and national politics surrounding the border, conservation and sustainable living, and the presence of drug traffickers and paramilitary forces in the vicinity.