In the United States, the dollar was commodity backed:

Name: In the United States, the dollar was commodity backed:
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The dollar was commodity backed until 1971 when President Nixon ended the convertibility of the U.S. dollar to gold. Prior to this, the U.S. government guaranteed that dollars could be exchanged for gold at a fixed rate. This system was known as the Bretton Woods system and was in place after World War II until it was abandoned in 1971.

In the United States, the Dollar Was Commodity Backed