In an effort toward peaceful negotiations, President Polk sent to negotiate the Rio Grande border dispute and the sale of California with .
a.
General Zachary Taylor, Antonio Lopez de Santa Anna
b.
Senator John Slidell, José Herrera
c.
Senator John Slidell, Mariano Paredes
d.
General Zachary Taylor, General Pedro Ampudia

C

Explanation:

i think it is a system for harvesting crops more easily

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.