The US Dollar dates back to 1794, and has become the standard of U.S. Currency. The US Dollar was inspired by the Spanish Dollar, which was used in Spain's North American holdings, such as Florida, and Mexico. The Spanish Dollar was used in the American Revolution as legal tender for trade (as the contentintal notes where lacking in print). The Dollar Coin was initially printed in silver, but later became a golden coin. The use of the Dollar coin diminished during the 20th century with the introduction of the $1 bill in 1963. The coin is most often called a Sacagawea following the 2000 edition of the coin, which features Sacagawea.