Final answer:
Federalism is the system of government in which power is divided between a central authority and individual regional political units. This allows for the sharing of power between the national and state governments, creating a federation.
Step-by-step explanation:
Federalism is the system of government in which sovereignty is constitutionally divided between a central authority and individual regional political units, such as states. This means that power is shared between the national and state governments, creating a federation. It is an institutional arrangement that creates two relatively autonomous levels of government, each possessing authority granted to them by the national constitution.