The one dollar coin has been a part of American currency since 1794. It has gone through many changes over the years, but it remains a popular coin among collectors. The one dollar coin is made of a variety of metals, including copper, nickel, silver, and gold. The most common one dollar coins are the Sacagawea and the Presidential coins. The Sacagawea dollar was first issued in 2000 and features a portrait of Sacagawea, the Native American woman who helped guide the Lewis and Clark expedition. The Presidential dollar series was issued from 2007 to 2016 and features portraits of all the U.S. presidents. The value of the one dollar coin depends on its condition and the year it was issued. Coins that are in good condition and are rare can be worth hundreds or even thousands of dollars. For example, a 1794 Flowing Hair dollar can be worth up to $10,000. The one dollar coin is an important part of American currency and has a long and interesting history. It is a popular coin among collectors and can be worth a lot of money depending on its condition and year of issue.