2-day delivery would be uncompetitive in The Netherlands. Next day delivery is the standard for webshops here, and most offer same day delivery as a paid upgrade when you either order before noon or live in a large city.
Still the general point stands.
The Netherlands is like a quarter of the area of New York state alone, and has about the same population.
yeah, it'd be nice if Amazon had an urban discount in the US :). Deliveries to large multifamily buildings must be tons more efficient than to the 'burbs.
Or the large markets subsidize the small ones just to maintain market dominance.