No two countries that both have a McDonald's have ever fought a war against each other.
The nearest this theory had got to be proven wrong, was during the Falklands War, but now it finally has: The Russia-Georgia conflict (if people count it as a war).
The theory is simple : If the the standard of living of the middle class of the two respective countries has reached such a stage where the country can sustain a McDonald outlet or a few of them, then their chances of going to war considerably reduce.
Interesting theory...After the Big Mac Index, used to calculate the PPP(Purchase Power Parity) by 'The Economist' for calculating the price of one Big Mac burger offered by McDonalds, here is another economic/civil term going to be used. Very rightly said by the 'Guardian' : McWar and McPeace.
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