Authority is often shared across federal, state, and local governments. Congress may finance a program or regulate under an enumerated power; federal agencies administer national statutes; states exercise broad police powers and frequently deliver services; local governments operate schools, utilities, transit systems, and land-use rules under state law. Grants connect these levels. Categorical grants direct money toward defined purposes and conditions, while block grants generally give states broader discretion within a policy area. Mandates, matching requirements, and waivers can further shape state choices.

Federalism can combine national resources with local knowledge, but it can also complicate accountability. A state may blame federal rules for a delay, while national officials blame weak state administration. Geographic variation can reveal useful experimentation: one state's approach may diffuse to others or become a national model. Variation can also produce unequal access when administrative capacity, revenue, or political priorities differ. Evaluation should compare population needs and implementation conditions before calling one jurisdiction more successful merely because its raw numbers look better.

Consider a federal clean-water statute that sets minimum standards, provides grants, and leaves local utilities to replace pipes. Congress authorizes and funds; a federal agency writes national rules; states coordinate projects; local utilities perform construction. No single actor "owns" the result. A CLEP question may ask which level has a particular power or why implementation differs across states. Trace the legal authority and administrative task instead of assigning all domestic policy to Washington or all local services to the states.

Video lesson: Introduction to the public policy process | US government and civics | Khan Academy