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I did that all about five or six years ago now, so I don't recall - but if I were to hazard a guess, it'd likely just be a lack of knowledge about the relative size / importance of Canadian cities and a lack of adequate time to research the topic. It may also have been a factor that we needed a geographically even spread of cities for the event system to work properly, and both the cities you mention are fairly close to the US border. Picking cities in the middle of nowhere gives us much better terrain coverage.