if you really don't understand how vastly different economic structures and scales of social complexity create (or, simply ARE) different forms of organization (government inclusive)... shit, i don't even know where to start...
Our government was created specifically to have extremely limited powers. It even came with an operating manual that has a lists the extent in which it may go. Our economic model is not part of our government model.
How does Wal-mart & Government Motors (which is already way, way beyond its grasp) change our limited federal government? Sorry Chumley, a larger nation & more impressive corporatiosn does not a dictatorial nation make.