I found the answer. i2amroy wrote this in “ Draft of the Cataclysm Lore Writeup - #3 by i2amroy “ in the first line
T-20 Years: Nuclear power becomes increasingly miniaturized, with the required size limits dropping every year. Bowing to various pressures and the lack of use of printed money, the U.S. Federal Reserve and Department of the Treasury merge into a single entity, the Consolidated Computerized Bank of the Treasury. This new organization switches to a cash card based system, and cash cards become readily available for printing at all ATMs for a minor fee.
Thanks everyone!