Question

How did americans re-emerge after the civil war and rebuild a nation torn apart by war and prejudice?

Answer 1

It did not.

America, sadly, is still feeling the effects of the Civil War through problematic policing and racist housing parties.

This is a result of a policy of reconstruction that was ultimately discarded to help broker a political peace. The South was given back the keys to the kingdom quickly after committing treason and newly freed slaves were subjected to Jim Crow laws.