:) What is the lowest denomination of paper currency ever issued by the U.S. government?

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Answer: 3 cents. During the Civil War, when people were hoarding coins for their metallic value or melting them down to make ammunition, the U.S. Bureau of Engraving and Printing started issuing postage-stamp-size “fractional currency” in 3, 5, 10, 25, and 50 cent denominations. The practice ended in 1876.

Source: The 365 amazing trivia facts calendar for 2007