Mexican American War (13 mayo 1846 año – 26 mayo 1848 año)

Descripción:

On May 13, 1846, the United States Congress declared war on Mexico after a request from President James K. Polk. Then, on May 26, 1848, both sides ratified the peace treaty that ended the conflict.

The conflict centered on the independent Republic of Texas, which opted to join the United States after establishing its independence from Mexico a decade earlier.

The new U.S. president, James K. Polk, also wanted Texas as part of the United States, and his predecessor, John Tyler, had a late change of heart and started the admission process before he left office. Polk and others saw the acquisition of Texas, California, Oregon, and other territories as part of the nation's Manifest Destiny to spread democracy over the continent.
Mexico considered the annexation of Texas as an act of war, and after border skirmishes, President Polk asked for the war declaration, since in Article I, Section 8 of the Constitution, only Congress can declare a war.

In the fighting that followed, the mostly volunteer United States military secured control of Mexico after a series of battles, and the Treaty of Guadalupe Hidalgo was signed on February 2, 1848.

It was the first large-scale success of a United States military force on foreign soil.

Mexico received a little more than $18 million in compensation from the United States as part of the treaty.

The pact set a border between Texas and Mexico, and ceded California, Nevada, Utah, New Mexico, most of Arizona and Colorado, and parts of Oklahoma, Kansas, and Wyoming to the United States.

On the surface, the war’s outcome seemed like a bonanza for the United States. But the acquisition of so much territory with the issue of slavery unresolved lit the fuse that set off the Civil War in 1861.

The underlying issue of how adding new states and territories would alter the balance between free and slave states was critical.

The Missouri Compromise of 1850 attempted to appease Southern concerns about the shifting balances, but the die was cast as the nation headed toward the Civil War in 1861.

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