Industrialisation.
The UK began industrialising in the mid-to-late 1700s. Western Europe and North America got going in the early 1800s. Central Europe and Japan followed along, while Russia didn't really industrialise until the Soviet Union. China and Korea, by contrast, just started in the 1950s-70s, easily within a human life time. Their societies made the leap from subsistence farming to CPU design _so_ much faster than most of the developed world, it's unreal.