Later on as the Head of Indian Affairs (in office), Clark was very compassionate towards the Native Americans, despite having a president that was very anti-Native American (Andrew Jackson). For example, Clark negotiated treaties with the Natives instead of directly enforcing them. After his famous expedition ended (late 1806), Clark served as the legal guardian for Sacagawea's children, as she didn’t have anyone else to fill that role. William Clark was not only a committed and compassionate man, but also a great leader. He helped lead one of the United State’s greatest expeditions, and served as a strong, but just, politician. We should continue to look up to him as a role model. As Clark stated, “Boys, be ambitious. Be ambitious not for money, not for selfish aggrandizement, not for the evanescent thing which men call fame. Be ambitious for the attainment of all that a man can