The population density is a bit of a factor. Like I live in a region in the US that is about the same size as Netherlands by area and has about 1/50th the population. And then if you go out west the difference gets starker than that.

Of course higher density parts of the US also don't really match up with the infrastructure that exists in Netherlands, but it's not unreasonable to expect the infrastructure in a given area to scale with the number of people in that area.