Demand Note in the context of United States ten-dollar bill

From 1775 to 1779, the Continental Congress issued Continental currency banknotes. Then there was a period when the United States just used gold and silver, rather than paper currency. In 1812, the US began issuing Treasury Notes, although the motivation behind their issuance was funding federal expenditures rather than the provision of a circulating medium. In 1861, the US began issuing Demand Notes, which were the first paper money issued by the United States whose main purpose was to circulate. And since 1914, the US has issued Federal Reserve Notes.

Since 1971, Federal Reserves Notes have been the only banknotes of the United States dollar that have been issued. But at some points in the past, the United States had multiple different types of banknotes, such as United States Notes (1862–1971), Interest bearing notes (1863-1865), and Gold certificates (1865–1934).

A United States Note, also known as a Legal Tender Note, is a type of paper money that was issued from 1862 to 1971 in the United States. Having been current for 109 years, they were issued for longer than any other form of U.S. paper money other than the currently issued Federal Reserve Note. They were known popularly as "greenbacks", a name inherited from the earlier greenbacks, the Demand Notes, that they replaced in 1862. Often termed Legal Tender Notes, they were named United States Notes by the First Legal Tender Act, which authorized them as a form of fiat currency. During the early 1860s the so-called second obligation on the reverse of the notes stated:

By the 1930s, this obligation would eventually be shortened to: