Answer :
Propaganda posters had a negative effect on the JapaneseAmericans. They experienced increased discrimination because of these posters.
One negative effect of posters like this is that Japanese Americans experienced increased discrimination. Propaganda is used to influence people psychologically. With this device social perceptions may be alter.
A great example of this is also the propaganda used in the WWII, through which the Americans sought to change American perceptions of the Japanese.