If I could speak the local language and know basic information about the era and place, I would join the Navajo people from whence 12.5% of my DNA originated because I identify with that the most, it's strong in me. I feel like a fish out of water currently. I would be so happy with them. In fact I was recently in Arizona and I wanted so much to join the Navajos but I know it doesn't work that way. You have to be born in there in order to assimilate.
And I'd choose a point in history long before they were conquered by Europeans. I don't want to deal with any of that traumatic massacre bullshit.