How did growing division lead to the civil war and how were these divisions were resolved at the end of the war?

The Democrats and Whigs were sharply divided over the slavery issue, and their power struggles cleared the way for the rise of a new political party, the Republican Party, which was formed in 1854 and stood united in their determination to prevent the spread of slavery into the territories and preserve the Union.

it took two men to wrestle rome back from chaos and turn a republic into an empire. in the first century bc, rome was a republic. power lay in the hands of the senate, elected by roman citizens. but the senators were fighting for power between themselves.