When was the biggest civil war in US. What was the reason for the the war?

Well civil war began when there was a lng standing controversy between white and black People. and this lasted for about 3 years.

~does this Help~ TwT

just like you man, i personally think its either c or d

explanation:

but good luck with the test man

the main objectives of the progressive movement were eliminating problems caused by industrialization, urbanization, immigration, and political corruption.