Original sentence: 1862 - To finance the American Civil War, the federal government under U.1874 - The Specie Payment Resumption Act provided for the redemption of United States paper currency ("greenbacks"), in gold, beginning in 1879.President Abraham Lincoln issued a legal tender paper money, the "greenbacks"
Edited sentence: 1862 - To finance War Between the States, the federal government under U.1874 - The Specie Payment Resumption Act provided for the redemption of United States paper currency, known colloquially as greenbacks, in gold, beginning in 1879.President Abraham Lincoln issued a legal tender paper money, the so-called greenbacks