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The time period between 1492 and 188i
So I guess to answer your question I certainly think there were a lot of civilisational collapses in that time!
I guess I'm confused about what the point is doing? What civilizations correspond to the periods you're picking out in your historical point about logic? I would have thought there would be collapses in that period but maybe not!
Kuhn loss: change from theory X to Y, but not everything X could explain is explained by Y. That happens because centres of learning get wiped out (as e.g. with fall of Rome or the Inca), I'm just trying to rule out those cases - I want examples of more voluntary theory change.
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