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If you think about it from an evolutionary standpoint it’s perfectly logical.
This hasn’t actually been borne out in science. As a general rule, less complex human societies tended to be more willing to cooperate with outsiders. They shared hunting grounds, traded clan members, came together for more complex endeavors, and so on. It isn’t until the advent of agriculture, when people became attached to plots of land and felt the need to defend them from others, that we see these default attitudes start to shift - and racism as we understand it today is a thoroughly modern phenomenon, with no antecedent prior to the 17th century.
This is a big reason why many US city budgets are fucked. So much prime taxable real estate given over to parking lots that don’t generate anywhere nearly as much money for the public, but the market doesn’t care about that particular externality.