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Do you wish to know when paper money was first printed and metal coinage first minted in the United States of America? Or in the areas that later became USA? Or in the Americas?
The Spanish were probably the first to mint coins in the Americas. A coin might be divided into 8ths ... A usage with survives in the English language in references to a 25-cents as "two bits" and "8 bits: A dollar".
The "penny" was a coin in some areas, but it was superceded by the "one cent" piece when the colonies unified as the United States of America. The "decimal" coinage (instead of l.s.d. For pounds-shillings-pence ... Another tale in how l = pound and d = pence) may be an 18th-century USA invention.