THIS is where things get a little hairy, as least for me. So, we are set before the reboot movies, and even get a date at the beginning of the show.
"Set roughly ten years before the events of
Star Trek: The Original Series,
[2] the show sees the
Klingon T'Kuvma work to unite the 24 great Klingon houses, leading to a cold war between his race and the
United Federation of Planets that involves the crew of the USS
Discovery.
[3][4]"
https://en.wikipedia.org/wiki/Star_Trek:_Discovery
So, was this "cold war" thing totally new to the reboot? I know in the original Star Trek Klingons weren't allies until Episode 6, but I don't remember a reference to them at all in the reboot movies.
Can anyone help me out here?