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There's a grain of truth here. A huge grain. The US comics were long stunted by the Comics Code of 1954: http://www.mit.edu/activities/safe/labeling/comics-code-1954
It had been revised a bunch of times, but arguably it went away only in early 2000-s. Mostly because of the anime/manga influence.
An artist with a unique vision and aesthetic. Samurai Jack is one of my favorites.