During the lewis and clark expedition,
sacagawea and her child smooth relations with american indians.
the explorers found a water route from the atlantic to the pacific.
the explorers ignored the natural world and focused on american indians.
many skilled people of the frontier to smooth relations with american indians.

The best answer is Sacagawea and her child helped smooth relations with American Indians.  

In 1803 a scientific exploration to the far Northwest, beyond the Mississippi River was approved. The objective was to learn more about that region's geography, flora and fauna, and its economic possibilities. Two former army officers were hired, Meriwether Lewis and William Clark. During that expedition, Lewis and Clark added to their main party a remarkable young Shoshone woman named Sacagawea, who proved an enormous help as a guide, translator, and negotiator as the group headed westward into uncharted territory.

not sure might be he acquired the entire oregon territory from great britain

i guess so you did not explain the answer clearly so i can't