What power is granted only to the federal government? A. The power to enforce laws
B. The power to declare war
C. The power to collect taxes
D. The power to regulate trade within a state

B

Explanation:

Only the federal government can regulate interstate and foreign commerce, declare war and set taxing, spending and other national policies. ... The Treasury Department's duties, for example, include printing and regulating money. The president also serves as commander-in-chief of the United States Armed Forces.

by improved communication.