I agree, for conflicts to escalate wars to be had there needs to be a clear division into "us" and "them". Due to educational efforts like these people are on the same page, their mobility increases, I would even venture that it makes it more probable for people to seek economic connections with the outside world too. It's like France and Germany -- you can keep the us/them divide and have a war every few decades or you can tie their future together (Coal and Steel, EEC, EU) and they will have too much to lose not to be nice to one another.
Further to what you said, it has been pointed out that (with very few exceptions, meanwhile) there has never been a war between two countries that both had MacDonald's franchises.
