Not really. If you venture outside major cities, you'll find that a lot of the US runs on 3G at best.
I'm in an American city with a population equivalent to Reykjavik. I spend about 80% of my time on 2G and the remainder on 3G. The number of times I've seen LTE I can count on my fingers.
That'd be ~120,000 (according to Wikipedia). In case anyone else didn't know that off the top of their head.
A better analogy for Americans would be Springfield. You can almost just pick one: IL, MA, MO (OH is a bit too small).