Miss Elk: "My theory by A. Elk. Brackets Miss, brackets. This theory goes as follows and begins now. All brontosauruses are thin at one end, much, much thicker in the middle and then thin again at the far end. That is my theory, it is mine, and belongs to me and I own it, and what it is too."

The heretofore-designated "Prime timeline" is referred to herein as the "ENT/STD/PIC timeline." It's a branch universe created from the original TOS/TNG/DS9 universe by the events of the movie First Contact. The events of those TV series take place in a universe that splits to become the TOS/TNG/DS9 and ENT/STD/PIC timelines.
History between Cochrane's flight and TOS is different between the TOS/TNG/DS9 and ENT/STD/PIC timelines, which is why the pre-Narada incursion universe of Star Trek 2009 differs from the world portrayed in the TOS episode "The Cage" and other historical references that carry through to the end of DS9.

The heretofore-designated "Prime timeline" is referred to herein as the "ENT/STD/PIC timeline." It's a branch universe created from the original TOS/TNG/DS9 universe by the events of the movie First Contact. The events of those TV series take place in a universe that splits to become the TOS/TNG/DS9 and ENT/STD/PIC timelines.
History between Cochrane's flight and TOS is different between the TOS/TNG/DS9 and ENT/STD/PIC timelines, which is why the pre-Narada incursion universe of Star Trek 2009 differs from the world portrayed in the TOS episode "The Cage" and other historical references that carry through to the end of DS9.