Mmmm, well, Mrrzy, in several episodes of both TOS and TNG, there was mention of wars that took place in the late 20th century, or at some indefinite time shortly thereafter, such as the "genetic wars" (1990, in "Space Seed," with Khan and his shipload of genetically modified "superior humans") and I think Q sneered at Picard a few times about humans almost annihilating themselves with global wars.

But they weren't really all that consistent with their "future history."

Don Firth