Black swan event.
A black swan event is a high-impact event that is difficult to predict but that in retrospect appears to have been inevitable.
Examples
Examples of black swan events
Financial crisis in Asian countries in 1997 ...
Dot-com bubble in 2000 ...
Stock value loss after 9/11 attacks in 2001 ...
Hyperinflation event in Zimbabwe in 2008 ...
Housing market crash in the U.S. in 2008 ...
European sovereign debt crisis in 2009 ...
Crude oil crisis in 2014 ...
Brexit announcement in 2016
Any one else watch the Obama Netflix movie that predicts just that?
LEAVE THE WORLD BEHIND Final Trailer (2023) Julia Roberts, Ethan Hawke (youtube.com)
Terrorism definition. To use violence, threat of violence, fear for political gain/Change.