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: -Furthermore, the boundary was in dispute. 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: -Texas claimed the Rio Grande as its southern border. Mexico said the Nueces River, to the north, should be the border.

Detailed explanation-4: -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-5: -Texas and Mexico also disagreed with the location of the border. Texas claimed its border with Mexico was the Rio Grande, while Mexico claimed its border with Texas was at the Nueces River. This dispute over the Texas-Mexico border caused more problems when the U.S. annexed Texas in 1845.