Earlier quoted context omitted.
Building such a network is less economically feasible in America compared to Europe or China because of America's suburban sprawl. First, it'll cost more to build because you'll need to clear out a route of suburban housing to get between any two cities. Second, the population density of the US is less concentrated, which makes getting to the station take longer, and improves the relative attractiveness of other tran…
The Northeast has a density comparable to Europe. I do agree on the culture issue, however - Americans definitely prefer cars by default. Although in the Washington-Philadelphia-NYC-Boston corridor it may be possible, if there is ever a culture of large public works again.
Improve the trains, and people will eventually wake up to them.