You forgot the most important factor — space. The earth is running out of space for our bulging populations. We seemed to have forgotten the fears of overpopulation of a few decades ago after the green revolution sort of fixed the food shortage problem for a while. But if you have ever seen what happens when too many rats are stuffed into a cage, you sort of know the tribal violence that’s headed our way.

Jim Ridgway, Jr. military writer — author of the American Civil War classic, “Apprentice Killers: The War of Lincoln and Davis.” Christmas gift, yes!

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