Why do we know so little about early native american cultures? a. european diseases killed off many native american cultures, and many tribes did not have written language, so historical evidence is limited. b. little funding has been raised to financially support archaeological digs of ancient native american sites. c. the nomadic tribes burned all documents and selected artifacts before they moved to new locations, so no information was available. d. archaeologists did not recognize the benefits of learning about native cultures until most of the available information had been lost.