Same way it happened last time we had a bunch of major advancements in labor rights. Things get shitty everywhere, but at an uneven pace, which combined with random factors causes a spark to set off massive unrest in some countries. Torches and pitchforks are out, many elite heads roll, and the end result is likely to be even worse, but elites in other countries look at all this from the outside and go, "hmm, maybe we shouldn't get people so desperate that they will do that to us".