Then teach critical thinking. Disabuse them of the many silly approaches to history that they are likely to encounter, e.g. that it is possible to predict what would have happened if such and such an invention, or person, didn't exist at some particular time. Or that certain events of historical significance had a single root cause. Why resort to using a hopelessly inadequate tool like Civ when much better ones are available? The Polish government in 1938 wasn't above opportunism either. They were happy to march into Czechoslovakia with Nazis and take a chunk for themselves. https://en.wikipedia.org/wiki/Zaolzie Of course, that gave the Nazis a very good look at what forces the Polish could muster and soon after Polish people suffered unspeakable horrors.