I was wondering the same thing, but playing it you only fill in small border segments at a time, with the rest of the map filled in, so the projection doesn't change much.
The red lines are the only segments filled in via small border segments; the green and the blue lines require you to do much more of the country's outline.
The red lines are the only segments filled in via small border segments; the green and the blue lines require you to do much more of the country's outline.