Hello! :)
Brahmins.
Why?
Here is the highest social status to lowest so highest is Brahmins.
Nevertheless, the four varnas, from the top down, were: the Brahmins—Aryans (priests, scholars, and philosophers); the Kshatriyas—Aryans (rulers and warriors); the Vaishyas—Aryans (farmers, traders, merchants, and craftsmen); and the lowest caste, the Shudras—non-Aryans (laborers, peasants, and servants for the other.
Hope this helped and I hope I answered in time!
Good luck!
~ Destiny ^_^
They fought over the moral issue of slavery.
Butt this is what google told me xD
They fought over many reasons like...
Industry vs. Farming. ...
States' Rights. The idea of states' rights was not new to the Civil War. ...
Expansion. As the United States continued to expand westward, each new state added to the country shifted the power between the North and the South. ...
Slavery. ...
Bleeding Kansas. ...
Abraham Lincoln. ...
Secession. ...
Activities.
Weather or not the emperor could become pope