Final answer:
Federalism is a system of government that creates two relatively autonomous levels of government, each possessing authority granted to them by the national constitution.
Step-by-step explanation:
Federalism is a system of government that creates two relatively autonomous levels of government, each possessing authority granted to them by the national constitution. Federal systems like the one in the United States are different from unitary systems, which concentrate authority in the national government, and from confederations, which concentrate authority in subnational governments.