Mexican-American War
Briefly

The Mexican-American War was a conflict instigated by the U.S. annexation of Texas in 1845. Following President James K. Polk's ambition for territorial expansion, U.S. forces invaded California, New Mexico, and Mexico. The war concluded with the Treaty of Guadalupe Hidalgo, where Mexico ceded 529,000 square miles to the U.S. Historical perspectives often view this conflict as an unjust invasion, further exacerbating sectional divisions within the U.S. that contributed to the onset of the Civil War.
The Mexican-American War (1846-1848) was a conflict between the United States and Mexico, sparked by the US annexation of Texas in 1845.
After the fall of Mexico City in September 1847, the Mexican government relinquished 529,000 square miles of territory to the U.S. in the Treaty of Guadalupe Hidalgo.
The war has often been regarded as an unjust invasion, both by contemporaries and later historians, and would only inflame the sectional divisions in the U.S.
Mexico decided to invite Anglo-American settlers into Texas to exploit the region's untapped resources, leading to a significant influx of settlers.
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