Well, they didn't really give anything away voluntarily.
They lost a war, and got to suffer that as a consequence under postWW2 arrangments (and that was the light option, more like a slap on the wrist: they were also plans to fully deindustrialize and starve them to death https://en.wikipedia.org/wiki/Morgenthau_Plan ).
And they're building up a liking to fascism and national arrogance again in the last few decades. The Japanese too - which never repented for their attrocities to China either.
They lost a war, and got to suffer that as a consequence under postWW2 arrangments (and that was the light option, more like a slap on the wrist: they were also plans to fully deindustrialize and starve them to death https://en.wikipedia.org/wiki/Morgenthau_Plan ).
And they're building up a liking to fascism and national arrogance again in the last few decades. The Japanese too - which never repented for their attrocities to China either.