Although Polk formally relieved his peace envoy, Nicholas Trist, of his post as negotiator, Trist ignored the order and successfully concluded the 1848 Treaty of Guadalupe Hidalgo. Some Mexican factions refused to consider any recognition of its loss of territory. Army, under Major General Winfield Scott, invaded the Mexican heartland and captured the capital, Mexico City, in September 1847.Īlthough Mexico was defeated on the battlefield, negotiating peace was a politically fraught issue.
Navy blockaded the Pacific coast in the lower Baja California Territory. forces also moved against the province of Alta California and then turned south. forces quickly occupied the regional capital of Santa Fe de Nuevo México along the upper Rio Grande. declared war.īeyond the disputed area of Texas, U.S. Beyond sending troops, Polk also sent a diplomatic mission to Mexico to try to negotiate the sale of territory the attempt was unsuccessful. claimed the disputed area and sent troops. asserting it to be the Rio Grande and Mexico claiming it to be the more-northern Nueces River. But the boundary between Texas and Mexico was disputed, with the Republic of Texas and the U.S.
Polk advocated expansion by either peaceful means or armed force, with the 1845 annexation of Texas furthering that goal by peaceful means. Polk was elected on a platform of expanding U.S. In the 1844 United States presidential election, Democrat James K. ĭomestic sectional politics over slavery in the United States were preventing annexation because Texas would have been admitted as a slave state, upsetting the balance of power between Northern free states and Southern slave states. The Republic of Texas was de facto an independent country, but most of its Anglo-American citizens wanted to be annexed by the United States. It did not recognize the Velasco treaty signed by Mexican General Antonio López de Santa Anna when he was a prisoner of the Texian Army during the 1836 Texas Revolution. It followed the 1845 American annexation of Texas, which Mexico considered Mexican territory. The Mexican–American War, also known in the United States as the Mexican War and in Mexico as the Intervención estadounidense en México ( United States intervention in Mexico), was an armed conflict between the United States and Mexico from 1846 to 1848.
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