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Also during the (US) Civil War, acorns, peas, and all kinds of other things were used as coffee additives or substitutes. https://scholarworks.uttyler.edu/cgi/

• Balgair 6y ago
  That one is really interesting, as the US South actually does have a caffeine producing plant native to the area: Ilex vomitoria It also goes by Yaupon, or Black Drink, and is similar to Yerba Mate. The native americans in the area typically used it in rituals to the point of vomiting, hence the name. Due to this history, though, it was not used as a caffeine substitute during the war. https://en.wikipedia.org/wiki/Ilex_vomitoria https://en.wikipedia.org/wiki/Ilex_vomitoria