Challenge: reverse TL

Okay guys, I am undertaking a challenge. I want the community to give me a date and an end event and i will make a TL going backwards until the POD.

I may need help though...
 
I like it. Very original idea. My suggestion is:

December 17th, 1989: German citizens begin returning to cities in Germany as the radiation levels become tolerable.

Is it a nuclear end to WW2, or WW3?!?!? Anyway, feel free to throw out this if anybody else comes up with something better.
 
Here is something to make things even more confusing:

December 24th, 1989: World Health Organization (WHO) announces an end to quarantine for the cities of Rome, Vienna, Paris, Brussels, Munich, and Copenhagen. Biological hazard warnings are still in effect for Madrid, Lisbon, and Gdansk....

Was it a natural occurence? Was it biological weapons? How is it linked to the events of 12/17?
 
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