Greenbacks were paper currency printed during the Civil War.
Explanation:
Greenbacks were the paper money printed by the United States during the Civil War. The Union used this currency to keep the economy stable and to pay for the war.
President Abraham Lincoln ordered to issue $400 million Greenbacks to raise money for the Civil War on March 10th, 1862. Since then, Greenbacks were issued intermittently during the war, but this was criticized by bankers, as they said that Greenbacks would not be supported by precious metals, therefore causing great amounts of inflation.
