Which of the following events led to the mexican-american war?
a. the annexation of texas
b. the purchase of florida
c. the invasion of alabama
d. the capture of georgia

I think it is A. annexation of Texas.

Explanation:

A. The annexation of Texas

Explanation:

The annexation of Texas was the final trigger to the outbreak of the Mexican-American War that took place during 1846 and 1848. The armed conflict began, in part, as a result of a difference of opinion about what was the river that constitued Mexico’s actual northern border. Some claimed it was the Nueces, whereas others claimed it was the Rio Grande.

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.