USA HISTORY

Detailed explanation-1: -In 1845 the United States annexed Texas and subsequently engaged in a dispute with Mexico over the southern Texas-Mexico border. Texas claimed that its southwest boundary extended to the Rio Grande. Mexico claimed that the boundary was the Nueces River, which is 100 miles (160 kilometers) eastward.

Detailed explanation-2: -Mexico claimed that the southern boundary of Texas was the Nueces River, the Texan boundary while under Mexican rule. Americans, as well as the incoming President, claimed that the boundary of Texas was the Rio Grande River.

Detailed explanation-3: -The Rio Grande is the fifth longest river in the United States and among the top twenty in the world. It extends from the San Juan Mountains of Colorado to the Gulf of Mexico (1, 901 miles) and forms a 1, 255 mile segment of the border between the United States and Mexico.

Detailed explanation-4: -The region of focus in this analysis is the land that lies between the Río Grande River and the Nueces River. Under Spanish rule, this tract of land was the called La Colonia de Nuevo Santander. Under Méxican rule it was called Tamaulipas. Today, we call this region the Lower Border region of Texas.

Detailed explanation-5: -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).