"proximity+diversity=war"
Yeah.
That's kinda true in a sense of people getting along well. I mean, you show up and unpack your bags in Missippi, and when they come to welcome you to the neighborhood with a bowl of currants, and you make a funny face when you chomp into one thinking it's a giant grape? Well, you may reach a détente, but there just ain't gonna be a friendly relationship there. But that's not actually a fighting war. That's just cultural differences. We can mostly deal with that.