The layer-cake metaphor emphasizes allocation: national institutions concentrate on assigned national subjects while states govern local matters through their police powers. The model describes a tendency toward separated responsibility, not two governments that never interact. Courts, interstate commerce, taxation, and constitutional rights have always connected the levels.

A scenario fits dual federalism when administration, funding, and accountability remain largely separate. State operation of schools and federal administration of customs are stronger examples than a health program financed nationally and administered under shared federal-state rules. Classify the relationship shown rather than attaching the label to an entire century.

Dual federalism does not mean state law can nullify valid federal law. The Supremacy Clause still governs actual conflict, and national powers can reach conduct inside a state. The model is most useful for comparing institutional patterns with the more intertwined arrangements of cooperative federalism.

Video lesson: Federalism: Crash Course Government and Politics #4