Why did Lewis and Clark celebrate with the Shoshone tribe?

Lewis and Clark celebrated with the Shoshone tribe as a gesture of gratitude and goodwill after successfully negotiating for horses that were crucial for their expedition. The Shoshone, led by Chief Cameahwait, provided the explorers with essential resources and assistance, allowing them to continue their journey westward. This celebration reinforced the bond between the two groups and acknowledged the importance of cooperation between the expedition and Native American tribes.