Do Americans use the protective case of iphone? Is it a patent of China people?

It is also used abroad, but it is not as common as in China. Foreign mobile phones are cheaper to exchange, and there is no domestic distress. Therefore, domestic films and protective cases are more popular than foreign ones. Because we seem to like to protect everything with other things, such as car stickers. In 1980s, electric fans liked to be covered with covers, and later televisions, refrigerators, air conditioners, etc. This is a tradition in China.