Ripsnort,
Find yourself a wall mounted map of the world - a large one.
Now stand in front of said wall map, as you normally would. Now step backwards 2ft so that your nose is now 25 inches away from that part of the map depicting the USA. Look around... those other coloured areas you can see are countries. Yes - other countries. And there are hundreds of them, with dozens of different languages and dialects, cultures etc. Can you guess the US proportion of the world's surface area (including Alaska)?
It's less than 2%.