I've had a focus on Indigenous peoples for my BA and it's my understanding that historical knowledge has generally passed through narrative histories (e.g. storytelling, folklore). Then I heard in the news about Incan khipus which seem to have documented censuses and taxes; this made me wonder if there are any other historical documentation methods used by Indigenous people in the Americas that I'd never heard of? Further, is it likely that khipus were used pre-contact or is this possibly an idea picked up by Indigenous people from settlers?
[News story on this topic] (https://www.cbc.ca/radio/asithappens/as-it-happens-thursday-edition-1.4466385/harvard-undergrad-cracks-code-of-knotted-inca-rope-used-as-an-ancient-excel-spreadsheet-1.4466388)
I've written briefly on khipus before here and here, but I'd welcome any further questions on them. To sum up those answers, khipu were definitely used hundreds of years before even the Inca did, and they did record things beyond economic/political data- probably the exact kind of histories and myths you're interested in. Unfortunately, those are the ones we're least likely to decipher.
Are you asking for more information about khipus, or about other forms of documentation used in the Americas? Because I am happy to expound about the written/pictorial documents of Mesoamerica in the latter case.