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Greenbacks were emergency paper currency issued by the United States during the American Civil War that were printed in green on the back.[1] They were in two forms: Demand Notes, issued in 1861–1862,[1] and United States Notes, issued in 1862–1865.[2] A form of fiat money, the notes were legal tender for most purposes and carried varying promises of eventual payment in coin but were not backed by existing gold or silver reserves.[3]