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  1. Dollar coins were first minted in the United States in 1794. While true gold dollars are no longer minted, the Sacagawea , Presidential , and American Innovation dollars are sometimes referred to as golden dollars because of their color.

  2. Thus the United States moved to a gold standard, making both gold and silver the legal-tender coinage of the United States, and guaranteed the dollar as convertible to 25.8 grains (1.672 grams, 0.05375 troy ounces) of gold, or a little over $18.60 per ounce.