This here is one of the many Disney War Advertisements.
The beginning states that it was shown in Canada because America wanted them to support the war as well as the Americans at home.
All is a parade of Disney characters. With picket signs that show a message that if you and other people buy war bonds together, then you'll see America winning the war.
The downside is they used a lot of reused animation and alter it to make it look different. Probably due to the strike that occurred at Disney Studios during WW2.
It's alright to see. It's available on the Home Front DVD as well as several other shorts.