Yeah, I actually found that out recently. My sister wand I were watching an old black and white movie about hiter and the invaisons in europe. The ironic thing was that the movie was made a year before the US "offically" decalred they were in the war.
This was from a cartoon which Donald had a nightmare that he lived in Germany. He was forced to work against his will and praise Hitler, was treated horribly, and a few other horrible events happening to him during the nightmare. When he wakes up from the nightmare he kisses the American flag and joins the navy. This cartoon was made and shown during WW2. Many Disney haters have used this image from the cartoon to bash Disney.