Earlier quoted context omitted.
I think a lot of this is just because the USA is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to the USA:) Plus, this is a country made up of a little piece of every other country in the world. "American identity" is an ex post facto rationalization. Not to mention that politically we often oper…
Russia is bigger in terms of area, just two times smaller in terms of population, but 10 times more uniform, at least. You wouldn't be able to tell apart two typical provincial Russian towns from the opposite sides of the country. So, no, just the size itself doesn't seem like a complete explanation for this.
Whereas the U.S. has two heavily populated coasts and much of its land is arable, at temperate latitudes (at least with irrigation—setting aside water issues).