By 1846, the conflict between the USA and Mexico was all but certain. The ongoing animosity toward Mexico on account of the loss of Texas was unacceptable.
The Mexican-American War, fought between the United States and Mexico between 1846 and 1848, played a role in realizing America's "manifest destiny" to colonize the entire continent of North America.
The reasons behind the Mexican-American War of 1846–1848 included Mexico's refusal to acknowledge Texas' independence, Texans' desire for statehood, and the United States' desire to advance westward.
The Republic of Texas was annexed by the United States in 1845, and there was a disagreement about whether Texas ended at the Nueces River (a claim made by Mexico) or the Rio Grande (the U.S. claim).
Because President James K. Polk incited it by land theft and the spread of slavery, the United States' involvement in the war with Mexico was justifiable.
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