1 Jan 1486 Jahr - 1486: Originally called "Guldengroschen", silver coins equivalent to the gold coins "Gulden" are first minted. These introduces the idea of a reliable silver coin of high worth that can fulfill large volumes of trade.

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Sources:

Hertel, H. H. “History of the American Dollar.” Forbes 7, no. 9 (February 5, 1921): 298. http://search.ebscohost.com.libproxy.berkeley.edu/login.aspx?direct=true&db=fba&AN=89031692&site=eds-live.

Sumner, W. G. "The Spanish Dollar and the Colonial Shilling." The American Historical Review 3, no. 4 (1898): 607-19. doi:10.2307/1834139.