On some kind of Equality basis? It is possible, but hasn’t happened very much yet.
This is because of the basic nature of the present day nations, which stems from our state of Evolution.
The nations are too power and profit oriented to consistently treat tribal structures with Fairness and Equality. Justice becomes the rule book for the wealthy.
But, it is possible for nations to Peacefully co-exist with tribes. Several things have to be accomplished first:
(1) The “Mammonites” within each nation have to be eliminated or severely brought under control. This will isolate the excessive dictates, of the excessive wealth cadre, from the institutions of True Justice.
(2) The Co-operating tribes, of a Peace Loving Humanity, have to be able to equal, or surpass the power of the nations. This will make it “not worth it” for a nation, or nations, to aggress the tribes unjustly. This would include the tribes producing, themselves, or having a reliable source of, weaponry and a self-governance system that does not break down from uncooperative factions. This “stance” of national allied integrated tribes, can also provide much of their nation’s strengths, when confronted by foreign aggression.
(3) The integrated and allied tribes must be equally dedicated to Fairness and Justice and Peace, just as New Nations Evolve into this Moral State too. Co-existence is a two way path.
I would like to say here that a good dose of “Direct Democracy”, the Ideal kind that emanates from a well educated and responsible Citizenry would help the nations and the allied tribes within them, become the best they can be…Good, Reliable Partners in the co-existence between them, for the sake of the nation.
I imagine that it is possible, that the city structures and their Citizens, could be “within” tribal structures. It started this way, in the United States of America, but the city building element became dominant and the source of the resultant social design and structure into the future. What is left of the “Old Tribes” and what develops of the potential of “New Tribes” has to grow strong enough to counter the city builder infra and social structures. The spread of buildings has to stop, or be redirected underground. Populations have to be “stabilized” (equal deaths to births).
If We “have to” eat meat, then the Bison should replace, or be crossbred with, the Cow…it being more efficient to produce and healthier. Probably to become vegetarian would be the best solution for Human nutrition concerns.