It is, of course, the baseline division of human existence, probably dating from when the first person sparked the first fire. It’s a division that has been painful, bloody — and useful. Particularly in American politics.
“Vote for me,” goes the ageless, implicit appeal, “and I will protect us from them” — whoever “them” may be at any given time. Right now, “them” is, among others, anyone from south of the border who shows up on America’s doorstep seeking sanctuary.
And it might be good to spare a thought for “them” as the nation — or at least, the three-quarters of it that identifies as Christian — makes the turn into that faith’s season of light, compassion and hope.