That's the finding of this study from the New America Foundation. Here's the Foundation's data summary:
Last year, the New America Foundation’s Open Technology Institute published The Cost of Connectivity, a first-of-its-kind study of the cost of consumer broadband services in 22 cities around the world. The results showed that, in comparison to their international peers, Americans in major cities such as New York, Los Angeles, and Washington, DC are paying higher prices for slower Internet service. While the plans and prices have been updated in the intervening year, the 2013 data shows little progress, reflecting remarkably similar trends to what we observed in 2012.
Oh, and if you are interested in fast Internet service in the U.S. that rivals the best in the world, move to (or stay in) Chattanooga.