USA HISTORY

Detailed explanation-1: -The idea of manifest destiny-that the United States was destined to occupy the entire North American Hemisphere-came of age in the 1840s. It began with the annexation of Texas, which led to the Mexican-American War and the resulting great land cession.

Detailed explanation-2: -The Mexican-American War was the first major conflict driven by the idea of “Manifest Destiny"; the belief that America had a God-given right, or destiny, to expand the country’s borders from ‘sea to shining sea’.

Detailed explanation-3: -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-4: -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.