Why do Europeans and Americans have more facial expressions than Orientals and Africans?

Westerners can't possibly have more facial muscles than Orientals in terms of number...

Maybe they are more developed.

Again, Westerners have a more intense way of expressing themselves, like American cartoons, whereas the East has always been about subtlety and beauty, not necessarily subtlety and aesthetics, it's just that the environment we grew up in led us to get used to it.