US-Mexican War of 1846-1848
The #US-#Mexican War of 1846-1848, triggered by the US annexation of #Texas and a disputed border at the #RíoGrande.
Under President James K. Polk (1845-1849) and a succession of Mexican leaders, fighting spread from the #GulfCoast to the #Pacific, reshaping #NorthAmerica's political map.
The conflict unfolded in three main theaters.
- In the north, US armies pushed across the Río Grande and secured the frontier, halting Mexican counteroffensives.
- In the west, naval squadrons and volunteer columns occupied #California and #NewMexico, severing #Mexico's Pacific flank.
- A Gulf-coast landing then opened the road to the Mexican heartland, where a sustained campaign captured the capital and compelled peace.
The Treaty of #GuadalupeHidalgo (2 February 1848) ended hostilities:
Mexico ceded vast northern territories, including California and New Mexico, and accepted the Río Grande as the Texas boundary.

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