answer:
Lewis and Clark encountered around 50 Native American tribes during their expedition. Many Indians helped Lewis and Clark but some did not help and decided to go away or attack them.
but the 9 tribes they met were:
1. Missouri tribe
2. Shoshone tribe
3. Sioux tribe
4. Mandan tribe
5. Flathead tribe
6. Nez Perce people
7. Chinook tribe
8. Blackfoot tribe
9. Cheyenne tribe