What "backs" the money supply of the United States?

Name: What "backs" the money supply of the United States?
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Quizplus · Accepted Answer

The money supply of the United States is backed by the U.S. government's ability to keep the value of money relatively stable. This is maintained through various policies implemented by the Federal Reserve System, which controls the money supply and regulates interest rates. While the U.S. government does hold gold reserves, these reserves do not directly back the money supply.

What "Backs" the Money Supply of the United States