Explaining why 1870 was so important is more difficult, but far more interesting to me, than telling what happened. I have to roll things forward and see what traces still remain of that fateful year.
And I have to try not to stretch things too far, to hypothesize, to assume. The evidence is everywhere, if you look for it. And maybe from this analysis we can pick up some clues as to how to avoid another century like the Twentieth.