Through the 20th century and continuing today, the nature of federalism has changed over time with new demands that have tended toward a system where the state and national governments share many responsibilities. This is called
a Separation of power B cooperative federalism C distribution of wealth d socialism
For the answer to the question above, that is called "cooperative federalism" since the more that a federal (central) power works with state powers, the more the country can move forward. I hope my answer helped you. Have a nice day!
