USA HISTORY

Detailed explanation-1: -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-2: -The immediate cause of the Mexican-American War was a disputed boundary between the United States and Texas on the Nueces Strip. Mexico did not recognize Texas as legitimate American territory and Texas admission to the United States antagonized Mexican officials and citizens.

Detailed explanation-3: -In the end, Texas was admitted to the United States a slave state. The annexation of Texas contributed to the coming of the Mexican-American War (1846-1848). The conflict started, in part, over a disagreement about which river was Mexico’s true northern border: the Nueces or the Rio Grande.

Detailed explanation-4: -Texas Revolution, also called War of Texas Independence, war fought from October 1835 to April 1836 between Mexico and Texas colonists that resulted in Texas’s independence from Mexico and the founding of the Republic of Texas (1836–45).

Detailed explanation-5: -The annexation of Texas increased tensions with Mexico, because it had never formally recognized Texan independence. The United States and Mexico also disagreed on the location of the southern boundary of Texas. Polk offered Mexico money to settle the dispute and to purchase California and New Mexico.