What Indian tribe helped Lewis and Clark build a canoe?

To find the answer to your question, you can search for information related to Lewis and Clark's expedition and their interactions with different Native American tribes. Here's how you can get the answer:

1. Start by searching for "Lewis and Clark expedition."
2. Look for reliable sources such as official websites, historical archives, or reputable books that provide details about their journey.
3. Research the specific encounters Lewis and Clark had with Native American tribes during their expedition.
4. Look for information regarding tribes that helped Lewis and Clark build a canoe.
5. Cross-reference the different sources to ensure accuracy and reliability.

Based on my knowledge, the Native American tribe that helped Lewis and Clark build a canoe was the Nez Perce tribe. The Nez Perce, also known as the Nimiipuu, were a Northwestern tribe that played a crucial role in assisting the Corps of Discovery during their journey through the present-day American West. They provided them with supplies, guidance, and technical skills, including building canoes.