Southern Secession
Northerners believed that the national government's power was supreme over that of the states. Southerners felt that the abolition of slavery would destroy their region's economy. Northerners believed that slavery should be abolished for moral reasons.
The conflict in Serbia between Austria-Hungary and Russia help ignite World War I because Europe split into Allied and Central powers as countries honored alliances to fight together if attacked. The balance was built in a way that just a sparkle would have be enough to cause a big flame. The conglit i Serbia was that sparkle.
The correct answer for your following question would be : C. The due process clause
Due process clause is the legal requirement for the Governments to protect and respect all legal rights that are owed to a person. This clause limit the power of the Government, creating a more balanced power dynamic between the government and the citizen