Which power is exclusively reserved for the states?

The power to administer elections is exclusively reserved for the states because the U.S. Constitution grants states the authority to regulate the administration of elections within their borders. This includes establishing rules for how elections are conducted, including the organization of polling places, voter registration processes, and methods of voting. Each state can create its own election laws and procedures, reflecting the principle of federalism that allows states to maintain control over certain functions of governance.

In contrast, coining money, conducting foreign relations, and declaring war are powers that are reserved for the federal government. The Constitution explicitly assigns these responsibilities to the national government, as they pertain to issues that impact the country as a whole, requiring uniformity and a cohesive approach. Therefore, it is through the states that the mechanism for administering elections is exercised, reflecting their significant role in the democratic process.