For example, you should be able to walk into any Native American tribe and be able to seamlessly integrate yourself into their culture despite having zero background.
Not really. In a whole number of ways. I actually have no idea how you can say this with any honesty.
I mean, are you really arguing that national identity is the major stumbling block in integrating to a tribe in Papua New Guinea.... Here's a hint: Other :tribes: would have difficulty integrating, and they've likely never been introduced to the concept.
Please explain to me how you're so confident while simultaneously so widely and clearly wrong.