Well, the negative side of the tribal impulse never goes away, but political and economic factors certainty can radically amplify it. You don’t hear much anymore, since the green revolution, about overpopulation. But it’s population spillover due to war and global-warming and ever more people in finite livable spaces on earth that is upping world strife.

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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