I buy a lot of history books and the maps and pictures are sometimes lacking but not always. 1776 was good, lots of pictures. If you sell on the Kindle, then interactive maps would be a plus. For readers without an internet connection then you should carefully edit maps and use multiple pages to show details. Your main map could show the overview with numbered boxed areas that are shown enlarged on subsequent pages. Frequently, the map is simply shrunk to fit and no thought is given to how it will be viewed.
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