What do these green rectangles even mean? When did we start using them? And why are we talking so much about the peso? Today it’s the history of American money, from silver certificates to a greenback dollar. Featuring the voices of Stephen Mihm, Ellen Feingold, and Todd Martin.

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• To see Civics 101 in book form, check out A User's Guide to Democracy: How America Works by Hannah McCarthy and Nick Capodice, featuring illustrations by Tom Toro.
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