Concurrent powers
Concurrent powers are powers of a federal system of government shared by both the federal government and each constituent political unit. These powers may be exercised simultaneously within the same territory, in relation to the same body of citizens, and regarding the same subject-matter. Concurrent powers are contrasted with reserved powers and with exclusive federal powers.
Federal law is supreme, and therefore it may preempt to a state or provincial law in case of conflict. Concurrent powers can therefore be divided into two kinds: those not generally subject to federal preemption ; and, other concurrent powers.
In the United States, examples of the concurrent powers shared by both the federal and state governments include the power to tax, build roads, and to create lower courts.
