What State's rights issue was solved by Civil War?

States' Rights is the theory that state and local government's actions and laws in dealing with social and economic problems supersede federal actions and laws. The theory goes back to the founding of our nation. Jefferson and Madison advocated states' rights in the Kentucky and Virginia Resolutions. John C. Calhoun's Theory of Nullification, the South's justification for declaring independence from the US, also advocates states' rights. The argument of the States' Rights theory is that the Constitution is a compact between states, not between people. The states created the national government and gave it only limited power. States' Rights supporters believe that the state is closest to the citizen and can better reflect their wishes. This was one of the major causes of the Civil War. The South claimed that the North and West were ignoring the rights and needs of the South, therefore the South had the right to nullify its compact with the other states and declare its independence.