Via Ars Technica:
The authors produced a heat map of wind power capacity, which shows Greenland, the Amazon basin, and Central Africa whited out due to their ice cover or extensive forestation. The Great Plains of the US, the Russian steppe, and the tundra on the east side of Hudson Bay all have lots of potential, and the Patagonian grasslands positively glow. Divided up by nation, Russia comes out way ahead at over 118 PWh (Petawatt hours), with Australia in second at 86; Canada, the US, and Argentina round out the top five. Those same nations dominate the offshore potential as well, which adds another five to 25 PWh to their totals.
For the US, the total that could be generated within its territory is more than 23 times its current electricity consumption.