What is the purpose of the 10th Amendment?

What does this answer mean?

The purpose of the 10th Amendment is to say that powers not given to the federal government belong to the states or to the people. That's the answer USCIS accepts.

The 10th Amendment is the last part of the Bill of Rights, ratified in 1791. It says the powers the Constitution doesn't delegate to the United States, and doesn't prohibit to the states, are reserved to the states or to the people.

The amendment reflects how the Constitution was built. The federal government has only the powers the Constitution lists, such as declaring war, coining money, and regulating trade between the states. Everything else stays with the states or the people. That's the basis for state powers like running schools, police, and driver's licenses, which are answers to another question on the test.

Many people who approved the Constitution worried that the new national government could grow too strong. The 10th Amendment was a way to make the limits clear.

At the interview, say "powers not given to the federal government belong to the states or to the people."