1. Chinook: The Chinook people inhabited the area around the mouth of the Columbia River. They were skilled fishermen and traders and played a crucial role in facilitating trade and communication between different Native American tribes in the region.
2. Nez Perce: The Nez Perce were a tribe of Native Americans who lived in the Pacific Northwest. They were known for their horse culture, extensive trading networks, and rich cultural traditions. The Nez Perce played a significant role in guiding Lewis and Clark through the vast and rugged terrain of the region, providing valuable assistance and insights during their expedition.