Let's take two hypothetical scenarios:

---

1) We maintain our current diversity of thought, race, views, and all other things - but we have an infinite and homogeneous world that stretches out, in identical fashion, in every direction endlessly.

2) We have the world the same as we're in, but everybody is literally identical. To the point that we're effectively 8 billion twins with an identical upbringing.

---

In which scenario do you think there would be less war? To me this feels nearly like a rhetorical question, but it may well be that we simply see things very differently!