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After the US Civil War (1865-1935), the US government created charters for private banks to print paper money which was backed by the US Government. There were a very large number of national banks chartered from all over the USA (e.g. Nashville, Tennessee; Key West, Florida; Bismarck, North Dakota; L.A., California). Many people collect "nationals" and the prices have gone up substantially (to around the 150 dollar level on average).
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