What's the earliest point in time we can definitely say that "our" universe splits from the universe Trek takes place in?
I'd like to try and stay away from minutiae like "There's no record of Sam Clemens meeting Guinan!" and "There was no such person as Edith Keeler" and focus more on major historical events. Obviously, we had no Eugenics War in the 90s, for instance. And things undone by time travel don't count either.
Off the top of my head, all I can come up with was the launch of the orbital nuclear platform in "Assignment Earth" which took place in 1968. It seems like everything that took place in the Trek universe up until then was pretty much the same. This also coincides with the idea that GR couldn't see the future.
Am I wrong?
I'd like to try and stay away from minutiae like "There's no record of Sam Clemens meeting Guinan!" and "There was no such person as Edith Keeler" and focus more on major historical events. Obviously, we had no Eugenics War in the 90s, for instance. And things undone by time travel don't count either.
Off the top of my head, all I can come up with was the launch of the orbital nuclear platform in "Assignment Earth" which took place in 1968. It seems like everything that took place in the Trek universe up until then was pretty much the same. This also coincides with the idea that GR couldn't see the future.

Am I wrong?