The document discusses the history and definition of the US dollar. It explains that the US Constitution gives Congress the power to coin money and regulate its value. The Coinage Act of 1792 established the US Mint and defined coins of gold, silver, and copper, including dollars. The Federal Reserve Act of 1913 established the Federal Reserve System and granted it authority to issue Federal Reserve notes as legal tender to be redeemed for lawful money. However, the dollar is technically a note or debt obligation rather than an actual coin backed by precious metals.