A couple ideas
#1...
The other idea is during the time of the natives, and they lived in north America for 20,000 years, they never killed their mentally disabled, but sent them out into the wilderness. Over that many years, they could have formed bands, (like the "un-housed" people do.)
Or they could have been people with hypertrichosis
Who would have also been sent away from the tribes.
Feet get big from walking with out shoes, people seeing someone hairy get scared, bigfoot in trying to scare someone makes himself look bigger, people crouch when scared, so bigfoot also looks bigger.
#1...
The other idea is during the time of the natives, and they lived in north America for 20,000 years, they never killed their mentally disabled, but sent them out into the wilderness. Over that many years, they could have formed bands, (like the "un-housed" people do.)
Or they could have been people with hypertrichosis
Who would have also been sent away from the tribes.
Feet get big from walking with out shoes, people seeing someone hairy get scared, bigfoot in trying to scare someone makes himself look bigger, people crouch when scared, so bigfoot also looks bigger.