[vinceguidry]

The historical evidence is the stories. Just like the Great Flood narrative which was likely over a thousand years old by the time it was first committed to writing, some people, somewhere dealt with some version of the stated events, and it got embellished throughout antiquity to fit the needs of whatever society saw fit to adapt the story. It's likely a flood happened, (which would have been at the level of the 'whole world' of the tribe that experienced it) it's likely an enslavement and subsequent freeing happened, though the actual details are of course lost to history.