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NASA finds humanity would totally fumble asteroid defense
(www.theregister.com)
This is a most excellent place for technology news and articles.
Iirc, it wasn't just that as far as Star Trek goes. Iirc, most world governments and economic systems were destroyed, humanity was a mere fraction of its peak population. Humanity literally physically came together because it was necessary to rebuild.
Its one thing to have a common enemy/suffering without changing anything else as far as governments and social systems goes. It's completely different when you not only have the enemy/suffering but to also need to literally rebuild everything from scratch
The most horrifying possible outcome of a World War is, arguably, there being a definitive "winner".
That's just not true. WWI had a definitive winner in Europe, but not in the Middle-East. And Turks are still killing people unpunished. And Germany wasn't a definitive loser, despite Entente countries making it really feel that role.
I'm pretty sure that didn't really happen until after the Vulcans showed up, TBH.
From Memory Alpha:
(WWIII ended in 2053; First Contact was on 5 April 2063)
Ah yea it looks like I was forgetting large parts, either way I think it still reinforces my main point, we will probably go through a lot more pain and suffering before we can even come close to Star Treks timeline