Answer:
Mexico severed diplomatic ties with the U.S. in protest after the annexation of Texas. Newly-elected President James K. Polk, rather than retreating, demanded even more concessions. In addition to extending Texas lands 150 miles southward to the Rio Grande, he demanded that Mexico cede New Mexico and California. The resulting war, presented by Polk as an invasion by Mexico of American land, divided the country, with Democrats siding with expansion, and Abraham Lincoln calling the war a "conquest brought into existence to catch votes."
Step-by-step explanation:
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