Propganda maps take many forms, but have the same purpose, to incite a specific line of thinking about a specific subject. Often associated with war time, such as the classic example below, propoganda maps can truly concern any subject, from politics to sports.
Found - http://www.calvin.edu/academic/cas/gpa/posters/map.jpg
This blog is a map catalog in which I am displaying fifty different types of maps and a tid-bit of information that looks into the purpose of the map!