Constitutionally, the federal government has nothing to give. It is the creature and servant of the states. They gave it all the authority it possesses, and they take it back whenever they wish.
Practically, that system has been turned on its head. The states have been transformed into administrative units of the federal government. It mandates their acts, provides much of their funding, and regulates their daily duties.
Basically, the states no longer have any responsibilities because they have no longer have any authority, and the two are inseparable. There is no more federalism, no more constitution, no more rule of law. There is only an authoritarian nation-state moving rapidly toward totalitarianism. We all should stop thinking in the outmoded terms of the dead checks and balances system and recognize the facts on the ground.