Vietnam, I towered above almost everyone. But now that I'm in Shanghai, I've been noticing that a lot of the Chinese people here are actually taller than I am - both men & women.
Wikipedia says that the average man in the US is 5'9" tall, & that the average urban Chinese man stands 5'7" tall. Judging from what I've been seeing, Shanghainese people may be taller than the national average. Maybe it's because of recent better nutrition?
China is a quickly developing country. The urban centers especially offer residents first-world luxuries like health care & good nutrition. Perhaps this latest generation in China will produce many more star basketball players, eventually knocking the US out of the running.