How did LEWIS & CLARK treat the Native Americans they encountered how was that different from later explorers?

Lewis and Clark encountered the Native American tribes in peace just to find the Pacific Ocean and when they went on the expedition with Sacagewea. Along that expedition Sacagawea carried her baby which demonstrated they meant no harm and meant peace. Charbannu or watever his name was, was Sacagawea's husband and he spoke Shonshone language so.......later settlers took over the Native American tribe lands and killed the people.