7 Most Valuable Half Dollars & How to Spot Them.How Much Is a 2 Dollar Bill Worth? Value Chart & Rarity Guide.The dollar coin was issued near the 200th anniversary of the expedition, which occurred from 1804 to 1806. It honors Sacagawea, the Shoshone Native American 15-year-old who helped guide Lewis and Clark on their famous expedition across what would later become the United States. The US Mint began issuing the Sacagawea dollar in 2000.
