The U.S. is ranked #8 in average broadband connection speed in Akamai's most recent State of the Internet. That puts it ahead of most of Europe: http://www.akamai.com/dl/documents/akamai_soti_q213.pdf?WT.m... (page 13). If you look at more densely populated coastal states, the U.S. looks even better. Yeah, South Korea has widespread fiber internet. More than half the country lives in the Seoul metro area. You can't compare.
Nation-wide averages tell a story that no one is interested in. Do you have data on densely populated coastal states? I want to compare speed and speed/Mbps to areas like Warsaw and Stockholm with high density cities in the US.
The problem with drilling deeper is that America is organized quite differently than European countries. It is typical for a European city like Stockholm or London for 40-60% of the people in a metro area to live in the denser, core city. In the U.S., that number is more typically 10-20%. Moreover, because of historical reasons, the dense inner cities in the U.S. that are most geographically amenable to building out fiber have huge proportions of poor people who couldn't afford it. Middle class people who might buy fiber are disproportionately more likely to live out in suburban areas less suitable for building such infrastructure.
Very concrete example: Delaware is one of the fastest states in the U.S., with average connection speeds in Akamai's study comparable to the top 5 countries in the global list. I live in the largest city in the state, a major rail hub, in the heart of downtown, and can't get fast internet because the area is so poor. But the suburbs right around us have fiber.
Per-city breakouts aren't in Akamai's most recent report, but here's one for Q4 '11: http://tumblr.thefjp.org/post/22270191498/the-worlds-fastest.... The fastest city in Sweden at 11.3 mbps wasn't that dramatically faster than the fastest in the U.S. at 8.4 mbps. Asia of course dominates, but that's because Japan and Korea have tons of very densely-built cities.
I would love to test all your hypotheses, I'm skeptical. My
impression is that, even if you compare dense high-income areas (Manhattan, SFBay), many other countries are still coming out on top. For instance, Warsaw (!) metro area: 631.4/km2, Manhattan: 27,227.1/km2. I don't have the numbers but income is much higher in Manhattan.
Wikipedia tells me I can get 60mbit/s down for under 25 USD in Warsaw and I think that is uncapped. I don't believe any comparable deal exists for Manhattan. SFBay is similar.
