The population spread of Norway more closely resembles that of Canada than that of the US, though. It's very difficult to inhabit large swathes of land in the north and center of Norway, so most people live in the southern and western parts of the country near the coast.

In the US, on the other hand, remote places are a lot more inhabitable. There are just more remote towns in the US, with more people owning more land and being spread out more as a result.

Of course, this doesn't excuse the fact that some dense towns in the US a few miles from a major city still have to deal with shitty broadband because no ISP is willing to invest in hooking them up to FttH. On average, though, the US will probably do worse than Norway for the foreseeable future because of the difference in where and how people live.