What was the columbian exchange
a. a trading post established by christopher columbus
b. an economic system set up by christopher columbus in the americas
c. the exchange of new goods globally as a result of europeans exploration
d. the trading of goods from columbia to north america

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.

b: the establishment clause  

b: socialism