Hey, uh, kid, wanna a Kriegsmesser? 's technically a knife.
True, but a lot less socialists than there ought to have been. A lot found some residual patriotism somewhere and... WWI. It was all bound up in various terrible social features of the period, of course, the skewed view of masculinity embodied by the white feather campaign and all the rest.
A shame. A real, honest-to-goodness shame. If people had been just an ounce less blinkered and we might have avoided WWI and WWII (which in many respects is WWI, part 2, now with better guns) both.
A damn fine one, too. I've taken a look at Wikipedia's list of AH fiction as well as Uchronia's timeline and I can't find anything of the sort. WWI, in general, is not something the AH community seems to like very much. It's all American Civil War and WWII as far as the eye can see. Seems oddly... unimaginative. How about a world in which the attack of the Sea Peoples never happened? A world in which the treasure ship fleets never stopped sailing?
(And I mention TV because while a 'Germans Win WWII' story is fine, of course, 'Socialists Make World Better' would be anathema. I find this... curious.)