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After 1845 the fact that Texas was now part of the United States was beyond dispute. Yet annexation did not calm tensions since the Texas-Mexican border remained a subject of dispute. The Mexican government defined the south and west border of Texas at the Nueces River. The Texas government, now backed by the U.S. government, declared that the Rio Grande was its southern border, a claim that increased the size of Texas by almost 200 percent. Predictably, Mexicoresponded to the Texans' belligerent declaration by breaking off diplomatic ties with the United States. This move set in motion a series of events that changed the pattern of Western expansion, foreign relations with Mexico, and American politics.

Provoking a War. Polk, meanwhile, was busy plotting how to gain the rest of the Mexican northwest for the United States. His first move was to send an envoy toMexico City with an offer to purchase California and New Mexico, an acquisition that would mean the loss of half of Mexico's territory, for $30 million. At the same time, he ordered American troops into the disputed territory between the Nueces and Rio Grande, and he dispatched a naval squadron into the Gulf of Mexico.

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14y ago

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