This Canadian Food Board poster from WWI discourages the hoarding of food and points out that fines and/or jail time are possible punishments. "Are you breaking the law? Patriotic Canadians will not hoard food.
Immigration Poster Encouraging British people to move to Canada. This country was looking specifically for immigrants from "white" countries at that time. This would be a great provocation image for Grade 6 Communities in Canada, Past & Present!