Interestingly, this is basically by design.
> No two countries that both had McDonald's had fought a war against each other since each got its McDonald's. [0]
[0] https://en.wikipedia.org/wiki/The_Lexus_and_the_Olive_Tree
> No two countries that both had McDonald's had fought a war against each other since each got its McDonald's. [0]
[0] https://en.wikipedia.org/wiki/The_Lexus_and_the_Olive_Tree
It should also be noted that there were plenty of experts who would tell you that the world is now too economically intertwined to be able to support any major war between major powers... in 1914. Economic integration preventing global conflict has been disproven time and again in history.
> [0] https://en.wikipedia.org/wiki/The_Lexus_and_the_Olive_Tree
It's worth noting that most of the wiki article is basically a list of counter-examples that proved that statement false. There have been a half-dozen wars between McDonald's-havers.