When was paper currency first introduced to the US?

Paper currency was first introduced in the United States during the Revolutionary War in 1775 when the Continental Congress issued the Continental Currency to help finance the war effort. However, the first official paper currency issued by the U.S. government was the Demand Notes in 1861, which were created to help fund the Civil War. The first widely circulated currency, known as Greenbacks, was also introduced during this period.