This is such optimistic poppycock! Such hopeful blather! Such unimaginable codswallop! At the risk of appeearing churlish: It simply nauseates yer ol perfesser for its utter, gibbering, an-historical naivete!
Humans are tribal creatures in our social dealings.
We BEGAN as SEPARATE entities in SEPARATE tribal chains of kinship.
We were NEVER "all one" tribe or family or race or species. There was no dissolution of some archaic oneness. There never was some grand unity.
Tribalism's head isn't ugly. It's how we are. Life is competitive; humans organized in tribes in order to further their competitive advantages for food territory and mating.
We're not large or strong enough to be solo hunters, like leopards or tigers. We're not numerous enough for the protection that herds/schools/swarms afford. Tribes "work," and that's how humans evolved.
There is a word in all indigenous, North American languages that designates fellow tribal members; it always translates as "the People," or 'the Humans,' obviously (lexically) excluding 'Others' from common humanity.
There are ALWAYS "insiders" (indigenes) and "outsiders" (exogenes), and it has required "civilization" to overcome the tribal distances and resistances, and allow (compel) competitors to cooperate.
