Why Americans Smile So Much - The Atlantic - May 3, 2017 - Olga Khazan
There's an interesting line of research that helps explain outliers on the other end of the spectrum, too: Americans and their stereotypically mega-watt smiles. It turns out that countries with lots of immigration have historically relied more on nonverbal communication. Thus, people there might smile more. So Americans smile a lot because our Swedish forefathers wanted to befriend their Italian neighbors, but they couldn't figure out how to pronounce buongiorno. Seems plausible.
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