Final answer:
Lewis and Clark found the Nez Perce to be hospitable and honest when they emerged from the Rockies during their expedition. The Nez Perce aided the expedition towards the Pacific Ocean, reflective of the expedition's goal to establish friendly relations with Native American tribes.
Step-by-step explanation:
The hospitable and honest Native American tribe that Lewis and Clark found when they came out of the Rockies were the Nez Perce. During the Lewis and Clark Expedition, after crossing the difficult terrain of the Bitterroot Mountains, the corps encountered the Nez Perce in what is now known as Idaho. These Native Americans were known to be both hospitable and honest, helping the explorers with food and information that assisted them in their journey towards the Pacific Ocean. The peaceful interactions with the Nez Perce highlighted an aspect of the Corps of Discovery's mission, which was to establish friendly relations with Native American tribes to facilitate future white settlement, as commissioned by President Thomas Jefferson.
While the expedition aimed to map out the land and forge relationships, it also led to U.S. expansion and the eventual relocation and mistreatment of many Native American tribes, including the Nez Perce, during the westward expansion that followed. The encounters with various tribes such as the Mandan, Shoshone, and Nez Perce were noteworthy, not just for their significance in aiding the expedition but also because they foreshadowed the complex and often tragic interactions between the U.S. government and Native American tribes in years to come.