The Sacagawea dollar series honors Sacagawea, a Native American woman of the Lemhi Shoshone tribe, Her name means "bird woman." Sacagawea's skills as a guide and interpreter were crucial for the success of the first overland expedition to the Pacific coast and back, initiated by US President Thomas Jefferson, and led by Meriwether Lewis and William Clark. Sacagawea was 15 years old at the start of the journey in 1804, and in the company of her husband, Toussaint Charbonneau, also in interpreter. She gave birth to a son, Jean-Baptiste, during the expedition.