Wirelessly posted
I only used Amerindians as an example because there are huge distortions about them. The methodology can be applied to any culture, so accusing someone of not mentioning Africans a bit silly.
First off, for oral history to be used, it must be recorded through some means be it through correspondences, codices, video tapes, digital reproduction, whatever.
Second of all, historians acknowledge people who produce primary sources don't really paint the full picture of their environment or time-frame. The choice of medium and audience omits crucial information due to the inherit nature of the medium.
Like say, if I was to record to preserve the first known footage of American Sign Language, the medium is going to be black and white. The films are going to be short, and what is conveyed is the stories the signer has to share. Right off the bat, there are several limitations: it's in black and white, it's only one person signing, the stories don't necessarily tell us much information besides the signs one person used during early 19000s and any implications derived from the stories; and there is no audio. As silly as it sound, the absence of audio for an early film leaves out clues like gutteral noises, background noises such as say-- maybe the coo of a Passenger Pigeon! Inclusion of seemingly meaningless details like this could have a vastly different interpretation.
Makes sense?