Americans are citizens of both their states and of the United States. In this system, power is constitutionally divided between the central government and regional (state) governments. What is this principle called?

i think it is the byzantine empire

  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

answer is d