Lewis and Clark would be interested to learn than were no Indian "Tribes" until the white settlers arrived.  They certainly identified several in 1803 on their way through the Pacific Northwest.    

"The Lewis and Clark Expedition established relations with two dozen Indian nations, without whose help the expedition would have risked starvation during the harsh winters and/or become hopelessly lost in the vast ranges of the Rocky Mountains."  

"A Statistical view of the Indian nations inhabiting the Territory of Louisiana", which outlined the names of various tribes, their locations, trading practices, and water routes used, among other things. President Jefferson would later present this report to Congress."

https://en.wikipedia.org/wiki/Lewis_and_Clark_Expedition