Brazil. Our population density map is not that different from the US, only it’s over one long shore, instead of three (four if you count the great lakes as a shore). Still, even deep into the Amazon region, like the city of Manaus, you can have 600 Mbps fibre for less than US$20.

Size of the country of population density is not the reason internet access is expensive in the US. Greed and corruption are.