Which of the following is a power that belongs to the states under the Constitution?

The ability to give a driver's license is indeed a power that belongs to the states under the Constitution. This falls under the category of state sovereignty, where individual states have the authority to regulate affairs within their own borders, including the issuance of driver's licenses. Each state establishes its own requirements, processes, and regulations regarding licensed drivers, allowing them to tailor their policies to meet the needs and preferences of their residents.

In contrast, the other options represent powers that are reserved for the federal government. Declaring war and conducting foreign relations are powers designated to the federal government, as they pertain to national security and diplomacy. Additionally, printing currency is a power that is also exclusive to the federal government, specifically managed by the U.S. Department of the Treasury and the Federal Reserve. These powers are defined in the Constitution and highlight the division between state and federal authority.