Under what system is the ultimate authority assigned to the national government, while the subnational governments can only exercise the powers the central government chooses to delegate to them?

Question

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In a unitary system, the ultimate authority is assigned to the national government, which can delegate powers to subnational governments or not. The subnational governments have only the powers that the central government chooses to delegate to them. This is in contrast to a federal system, where power is shared between the national government and subnational governments, with each level having their own area of authority.

Under What System Is the Ultimate Authority Assigned to the National