legendary Coins and Currency
Smithsonian National Museum of American History, Behring Center
Please choose one of the following: Inspect another coin or note Give money to Royal Inspector (United States, 20 Dollars - front) United States, 20 Dollars Front Back Why is our paper money green?  In 1861, the government decided to use green for all Federal paper money because it was the hardest color to counterfeit.  This new twenty dollar bill has extra features that make it harder to fake such as a security thread and a watermark.