Concurrent powers have which of the following effects on the united states political system? a. they reinforce the expansion of the power of the national government and the supremacy of the national law. b. they eliminate disputes between the states and the national government by creating completely separate spheres of influence. c. they foster cooperation between the states and the national government by requiring that the two levels of government work together. d. they make it possible for the states and the national government to simultaneously exercise influence in the same areas of public policy.

The correct option is D

Explanation:

Concurrent powers ensures that the national government and the states exercise power and influence at the same time, in same public policy area. Examples of concurrent powers in the United States are; the power to build roads, the power to create smaller or lower courts, and the power to tax its citizens and organizations.

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explanation:

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the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.