1845-1848: Mexican-American War - James K. Polk, despite not having a declaration of war, sent US troops into dispute territory between the Nueces and Rio Grande, provoking Mexico, a nation already ready to declare war. Later, pointing to a Mexican reaction, Polk asked for and received a declaration of war despite impassioned speeches by Abraham Lincoln on the contrary. The provocation of a war likely for the purposes of the annexation of territory including much of the American Southwest was a significant (1 ene 1845 año – 1 ene 1848 año)
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fecha:
1 ene 1845 año
1 ene 1848 año
~ 3 years