USA HISTORY

Detailed explanation-1: -The dispute surrounding assigning the border at the Río Grande or at Nueces River, coupled with the U.S. annexation of Texas in 1845, set the Mexican-American War into motion.

Detailed explanation-2: -It stemmed from the annexation of the Republic of Texas by the U.S. in 1845 and from a dispute over whether Texas ended at the Nueces River (the Mexican claim) or the Rio Grande (the U.S. claim).

Detailed explanation-3: -Texas claimed the Rio Grande as its southern border. Mexico said the Nueces River, to the north, should be the border. The dispute simmered until Dec. 29, 1845, when the U.S. annexed the Lone Star State, and sent troops to the Rio Grande a month later.

Detailed explanation-4: -The Mexico–United States border stretches from the Pacific Ocean in the west to the Gulf of Mexico in the east. Border states include the Mexican states of Baja California, Sonora, Chihuahua, Coahuila, Nuevo León, and Tamaulipas. U.S. states along the border are California, Arizona, New Mexico, and Texas.

Detailed explanation-5: -In 1848, the Rio Grande/Rio Bravo was named as the boundary between the United States and Mexico by the Treaty of Guadalupe Hidalgo. For the next hundred years, this border-defining river would meander, flood and retreat; changing maps, and lives, as it moved.