The US dollar denomination was based on the Spanish 8 Reales coin that was prevalent in the colonies at that time. For much of the history of the united states, the spanish coins were legal tender and traded on par with the dollar.
US 1 Dollar
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Cent
The United States one-cent coin, commonly known as a penny, is a unit of currency equaling one one-hundredth of a United States dollar. The cent's symbol is ¢. Its obverse has featured the profile of President Abraham Lincoln since 1909, the centennial of his birth. From 1959 (the sesquicentennial... -
Antoninianus
The antoninianus was a coin used during the Roman Empire thought to have been valued at 2 denarii. It was initially silver, but was slowly debased to bronze. The coin was introduced by Caracalla in early 215 and was a silver coin similar to the denarius except that it was slightly larger and...
