PLZ HURRY Why did Russia sign a treaty and leave the war?

a
They decided to keep the monarchy
b
The country was on the brink of collapse
c
They wanted to explore
d
The country wanted to expand their borders

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.