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en.wikipedia.org/wiki/Large_denominations_of_United_States_currency

Large denominations of United States currency greater than $100 were circulated by the United States Treasury until 1969. Since then, U.S. dollar banknotes ...

www.uscurrency.gov/security/100-security-features-2013-present

Learn about security features included in the $100 note, including a 3D security ribbon, color-shifting ink, a watermark, and microprinting.