Similarly, I read Pachinko a novel about Koreans in Japan in the period 1910-1940 (mostly). Koreans were all lazy, unintelligent, untrustworthy thieves. A stereotype that few would still hold today.....
"Korean time" used to be a thing. Before the "Miracle on the Han river" (which was actually a carefully orchestrated economic development program run by the South Korean government and not a "miracle" at all) South Korea was one of the poorest countries on earth.
Likewise, Germans were used or being drunk, largely unproductive and simple people. Then Prussia conquered conquered a large number of the german principalities and forced the other ones to join in a new German Empire. A massive economic boom followed, during which Germany was thoroughly industrialized.
