Which amendment refers to powers not delegated to the United States or prohibited to the states?

The correct response highlights the principles laid out in the Tenth Amendment of the United States Constitution. This amendment explicitly states that powers not delegated to the federal government, nor prohibited to the states by the Constitution, are reserved to the states or the people. This establishes a framework for federalism, emphasizing the importance of state sovereignty and limiting the scope of federal authority.

Understanding the significance of the Tenth Amendment is crucial because it reinforces the idea that the federal government has only the powers explicitly granted to it by the Constitution, while all remaining powers are kept by the states or the people. This concept serves as a foundational principle of American governance, ensuring a balance of power between federal and state entities.