# Every approx 20 years, a "Black Swan" shocking event completely changes America

**URL:** <https://boards.straightdope.com/t/every-approx-20-years-a-black-swan-shocking-event-completely-changes-america/849315>\
**Category:** Miscellaneous and Personal Stuff I Must Share\
**Created:** [March 12, 2020, 3:59am UTC](https://boards.straightdope.com/t/every-approx-20-years-a-black-swan-shocking-event-completely-changes-america/849315 "2020-03-12T03:59:20Z")\
**Posts on this page:** 1\
**Page:** 3

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**Author:** ![Omar\_Little](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/omar_little/32/269_2.png) [@Omar\_Little](https://boards.straightdope.com/u/Omar_Little)\
**Post date:** [March 19, 2020, 6:26pm UTC](https://boards.straightdope.com/t/every-approx-20-years-a-black-swan-shocking-event-completely-changes-america/849315/41 "2020-03-19T18:26:59Z")

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[Apophenia](https://en.wikipedia.org/wiki/Apophenia) has come to imply a human propensity to seek patterns in random information.

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