Here is my idea.
Create a Big Big Big North America by combining maps.
Using:
Alaska, 120 territories,
http://warlight.net/Map.aspx?ID=4533
Canada big, 332 territories,
http://warlight.net/Map.aspx?ID=2526
United States Big, 2109 territories,
http://warlight.net/Map.aspx?ID=572
Big Mexico, 863 territories,
http://warlight.net/Map.aspx?ID=5504