Japanese propaganda depicted Americans as a self-indulgent people contaminated by ethnic and racial diversity, as opposed to the racially "pure" Japanese.

During World War II, Japanese propaganda often portrayed Americans in a negative light, emphasizing racial and ethnic diversity in the United States as a form of contamination. This was contrasted with the idea of the Japanese people being racially homogeneous and "pure," which was used to foster national unity and justify Japan's expansionist policies.