You can download shared decks. On the mobile app, there’s a little floating button with a plus sign that takes you to the shared decks, but I find it better to use the desktop app to import so that I can go ahead and fix any formatting issues I have too (i find the default font size to often be too small).

Sorry, I’m gonna be that person… The US Mint makes coins, not the paper money. The Bureau of Engraving and Printing is responsible for printing, among other things, the paper money.