The states and the national government working together to implement public policy is an example of federalism.

Cooperative federalism.

Cooperative federalism is also known as marble-cake federalism, is federalism in which national, state and local governments interact cooperatively(or work in synchronous) and collectively to solve common problems, rather than making policies separately they work together to implement public policies for the public of the nation.

First this is not social studies(my friend rohanfighter can you he loves this