The quarter dollar coin has been a part of the United States currency since 1796. It was first minted in Philadelphia and was made of silver. The quarter dollar coin was originally known as the two-bit piece and was the first coin to feature the image of George Washington. The quarter dollar coin has gone through many changes over the years. In 1804, the coin was changed to a copper-nickel alloy. In 1831, the coin was changed to a copper-silver alloy. In 1965, the coin was changed to a copper-nickel alloy with a copper core. In 1975, the quarter dollar coin was changed to a copper-nickel alloy with a copper-clad core. The quarter dollar coin has also featured many different designs over the years. In 1932, the quarter dollar coin featured a portrait of George Washington on the obverse and an eagle on the reverse. In 1999, the quarter dollar coin featured the 50 state quarters program. This program featured a different design for each of the 50 states. The quarter dollar coin is an important part of the United States currency and has a long and interesting history. It has gone through many changes over the years and has featured many different designs. The quarter dollar coin is a great way to learn about the history of the United States and its currency.