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10. USA

America once led the way in average height, spurred by its high quality of living and copious dairy and meat products, but the times have changed and America has spent the last few decades growing out rather than up. Nevertheless, the land of the brave still boasts some supremely tall people, a large percentage of whom are earning millions dunking and swatting shots in the NBA. A recent poll, for example, estimated that nearly 20% of Americans over seven feet are currently playing professional basketball. Not a bad life.