After WW1 finished, Germany was left in a complete mess. It used to be a Federal Monarchy before and during the war. However, the ideology of FASCISM quickly rose in both Germany and Italy. Once Adolf Hitler and the Nazi's took over, FASCISM is what the Government was primarily based off.
Southern states wanted new slave territories, while the north wanted to contain the spread of slavery. while western expansion contributed to growing sectional tensions between the north and south from 1800-1820