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Anonymous
ANSWERS: 2
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The first "greenback" notes were the Demand Notes of 1861. http://en.wikipedia.org/wiki/Demand_Note These were effectively zero-interest bonds - they were not legal tender but could be exchanged for such. However, within a year they were followed by formal currency notes which had the same value. US currency printing tracked "state of the art" anti-forgery up to about the 1890s, when it froze. The international status of "the greenback" caused its format to be frozen unti quite recently.
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why is u.s. currency the color green?
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