The us system of federalism is based on

Federalism is a political concept in which a group of members are bound together by covenant with a governing representative head. The term "federalism" is also used to describe a system of government in which sovereignty is constitutionally divided between a central governing authority and constituent political units (such as states or provinces).

The framers of the United States Constitution based our federal government onfederalism, which is a division of power between the federal government and the individual state governments. Dual federalism was our first system of federalismthat lasted through the end of the 1930s.

3. i would say one, but one is not prime nor composite.