Maps of this type, where the area is scaled to match some value, are called "cartograms." Most cartograms you see will have the distortion that these maps have, where the original shapes and angles of the country are kinda lost when a lot of scaling has to be done.
In the last couple years, a new technique for generating cartograms was discovered that borrows techinques from the simulation of gaseous diffusion. This new technique is much faster than the old, and also has the advantage of a greater sense of the original shape. You can see cartograms done with the new technique here:
http://www-personal.umich.edu/~mejn/election/
A description of the new technique (along with some cartograms) can be found here:
http://www.sciencenews.org/articles/20040828/bob8.asp