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The article focuses on the U.S. Congressional Research Service's it reports on design and features of U.S. paper currency. It describes the history of paper money in the U.S., it mentions the introduction of greenbacks during the Civil War and the establishment of the Secret Service Division to combat counterfeiting. It discusses the current design of U.S. currency, including the portraits featured on bills, and the three levels of security features to guard against counterfeiting.