What were greenbacks?
Were and are!! US paper money -- because they are green on at least one side.
http://www.answers.com/topic/greenback
http://en.wikipedia.org/wiki/Greenback
Greenbacks were a form of paper currency that was issued in the United States during the American Civil War. They were known as "greenbacks" because the reverse of the bills were printed in green ink. The issuance of greenbacks was a means for the U.S. government to finance the war effort and stabilize the economy, as the war had caused a shortage of gold and silver coins.
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