cooperative federalism’ different from ‘regulated federalism

1- What is federalism? In general terms, how is power distributed in the United States?

2-What is the ‘commerce clause’ (Article I, Section 8)? How does this allow the national government power over the states?

3- What are the police powers of the states? How are the distinctions between national authority and state powers made murky by the concept of ‘concurrent powers’?

4- How is ‘cooperative federalism’ different from ‘regulated federalism’