U.S. coins have changed many times since the Coinage Act of 1792, which adopted the dollar as the standard monetary unit.
Silver dollars have been minted and issued at various times since 1794. Dollar coins were discontinued in 1935, then resumed in 1971 with the introduction of the silverless Eisenhower dollar. The silverless Susan B. Anthony coin, honoring the famed women's suffrage advocate, replaced the Eisenhower dollar in 1979. A new dollar coin authorized in 1997 replaced the Susan B. Anthony coins in 2000. The new coin depicts Sacagawea, the Native American woman whose presence was essential to the success of the Lewis and Clark expedition. The coin has a copper core clad in an alloy of copper, zinc, manganese, and nickel, which gives the coin a golden color
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