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:[1]
This Note is a Legal Tender for all debts public and private except Duties on Imports and Interest on the Public Debt; and is receivable in payment of all loans made to the United States.
By the 1930s, this obligation would eventually be shortened to:
This note is a legal tender at its face value for all debts public and private
They were originally issued directly into circulation by the U.S. Treasury to pay expenses incurred by the Union during the American Civil War. During the next century, the legislation governing these notes was modified many times and numerous versions were issued by the Treasury.
United States Notes that were issued in the large-size format, before 1929, differ dramatically in appearance when compared to modern American currency, but those issued in the small-size format, starting 1929, are very similar to contemporary Federal Reserve Notes of the same denominations with the distinction of having red U.S. Treasury Seals and serial numbers in place of green ones. Also, while a variety of denominations were issued as United States Notes during the large-size era, only the $1, $2, $5, and $100 denominations were ever issued as small-size notes.
Existing United States Notes are still fully usable and are considered legal tender. However, as no United States Notes have been issued since January 1971, all issues have all but disappeared from circulation, and command higher prices than face value as items of numismatic interest.