I read the most amazing article about how difficult it would be to invade the United States. First, we are the 3rd largest country behind Russia and Canada with 4 time zones and variable environments so invaders would have to go through deserts, mountains, swamps, forests, and farmlands, not counting Alaska or Hawaii which would be easier to invade by themselves (Remember Japanese did attack those areas first, but not the Continental Coast). 2nd is we have 2 long coastlines and all land is bordered by Canada and Mexico who are our allies when Trump is not president. If D-Day is evidence of difficulty of a coastal invasion, remember that British Isles were 3-hour boat ride across the English Channel from Normandy. 3rd would be our weapons and technology: like computers, smartphones, GPS, Interstate Highways, drones, nuclear arsenal, satellites, stealth bombers, and don't forget all the forts, naval bases, aircraft carriers, ships, and submarines guarding the coastlines. We track h...