Society tends to repeat on approximately 80-100 year cycles.

American society. And it's been closely shown to hold since when America attacked Canada, of all places.

Other countries have their own cycles. Consider the 11-year Canada goose purge cycle that affects your friends to the north. It's not spoken of but, like seal clubbing, a periodic culling is required to prevent them invading and burning the Library of Parliament and goosey sanchez-ing the last copy of the Declaration upon Dependence. It's a little backward up there.