War, and Iraq - which leads to death
Answer:
The definition of federalism is straightforward: it is the federal principle or system of government. Throughout history, it has been a political system where 2+ governments share authority over the same geographical area.
Well, it decreased the demand of Slave Labor.
Back then, the technology advancement , especially in agricultural sector, significantly increased the total production. This cause the demand of overall labor decreased. The northern US, who utilized more of this advancement more than their southern neighbor, manage to produce hundred times more output than the southern who still depended on their slave labor
For the same reason many others were. There were many people who believed that they should have the right to rule the country which led to a lot of infighting. This was common for countries that gain independence, especially in Africa where tribes still fight for control nowadays even though the age of colonization is over.