The Federal Bargain

American federalism is a standing negotiation in which a written division of powers meets two centuries of national reach, conducted through law and money.

Start with the design. Two levels, each autonomous, each holding constitutional grants (Gov 056): a written list for the national government (Gov 060), an elastic clause to execute it (Gov 061), a residue rule keeping the rest with the states (Gov 062), and a supremacy clause to referee collisions (Gov 064). Then the courts opened the doors. *McCulloch v. Maryland* read the elastic and supremacy clauses together, upholding implied national powers and barring state interference (Gov 067); *Gibbons v. Ogden* read the commerce clause broadly enough that, in time, the interstate line became hard to find (Gov 068). The phases follow: separate spheres in the layer-cake era (Gov 070), joint operation in the marble-cake era (Gov 071), and a decentralizing push from the 1970s onward (Gov 073). Notice what the negotiation runs on now — money. Categorical grants buy compliance in detail (Gov 074); block grants buy it loosely and then tighten (Gov 076 stands behind Gov 075); unfunded mandates skip the buying and command (Gov 077). The bargain's permanent tension closes the unit: the same variation that makes states laboratories (Gov 078) makes rights and burdens depend on a person's address (Gov 079). The design guarantees the negotiation; the negotiation never ends.