Many international visitors notice how much US citizens smile and how cheerful they appear. Read more about this observation inWhy Americans Smile So Much at https://www.theatlantic.com/science/archive/2017/05/why-americans-smile-so-much/524967/. Interesting research and facts. Excerpt:
Other than causing consternation for tourists, these cultural differences in the value and uses of smiles are also why it can be hard for iconic American companies to expand overseas. As a recent episode of Invisibilia showed, when McDonald’s entered Russia in the ’90s, they had to coach their employees on how to smile.