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Which of the following is a power reserved for the states in the United States?

  1. Declaring war.

  2. Regulating commerce.

  3. Coining money.

  4. Establishing post offices.

The correct answer is: Establishing post offices.

Establishing post offices is a power specifically delegated to the states in the United States. This means the state governments have the authority to regulate and manage their own post office systems. The other options listed, such as declaring war, regulating commerce, and coining money, are all powers that are reserved for the federal government, not the states. These powers are outlined in the United States Constitution as being under the jurisdiction of the federal government, while the power to establish post offices is specifically left to the states. This division of powers between the state and federal governments is known as federalism and is an important aspect of the United States government's structure.