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I'm glad you went through and found that; the US has ravaged third-world democracies for a quite a while now.

And what about the McDonald's-rule: "Two countries with McDonald's don't go to war with each other."?

Does it hold up?

Edit: The answer is in the linked page. (It's "No, but better than the other rule.")

the US has ravaged third-world democracies for a quite a while now

That's only a counterexample if the US is a democracy... :)