Which pushed the united states to go to war against mexico in 1845? a. an invasion by the mexican army into the southwestern united states b. arguments in favor of war from abraham lincoln and others in congress c. manifest destiny and a desire to extend slavery into mexican territory d. years of failed negotiations over the disputed oregon border

A.an invasion by the Mexican army into the southwestern United States

answer: president kennedy is vowing to protect freedom in this paragraph.

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.