Ways it helps America:

* His shareholders include many Americans. The cash pile is concentrated as far as corporate governance is concerned, but lots of people own a piece of it in their retirement accounts. (Often indirectly via index funds.)

* Many employees work for businesses owned by Berkshire Hathaway. I'd guess they're pretty stable businesses, not about to get bought out and shut down? Maybe decent places to work? (Not sure about the railroad, though.)

* Many people are customers of these businesses. Mostly a good thing?

Admittedly there are lots of Americans that don't participate in that, though.