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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.

This answer is correct because establishing post offices is a power specifically listed in the Tenth Amendment of the United States Constitution as a power reserved for the states. Option A, declaring war, is a power given to the federal government and not reserved for the states. Additionally, option B, regulating commerce, and option C, coining money, are also powers given to the federal government. Option D, establishing post offices, is the only power in this list that is reserved for the states.