Reconstruction was resented in the South because it represented federal control over the Southern states. Federal troops were stationed in the South and the region was divided into military districts. It also featured the reframing of civil rights and liberties as it related to African Americans. The passage of the 13th, 14th and 15th Amendment as well as the establishment of HBCUs marked a significant change in the plight of African Americans.
Explanation: Reconstruction (1865-1876) was a crucial moment in American life. It witnessed important regional transformation in the south and repositioned African Americans in the national life.
A federal system of government is one in which power is distributed between a central authority and smaller political units such as states. The framers of the Constitution designed a federal system because they thought it would prevent central government from having too much power.
Assuming you're referring to the United States, the Constitution grants these powers only to the federal government--specifically Congress--meaning that the states have no war powers.