Nonverbal Communication

During the past three weeks I've been in America I noticed that there are many differences in gestures, eye contact and body space between this country and my homeland.
In China girls hold each other's hands to show they are very good friends. In America, however, people consider the girls who hold hands lesbians or they are in a relationship.
As Chinese is a implicit nation, when people expresss the meaning of "I love you" they do not look straightly at the other one's eyes, but American guys are very outgoing and open-minded, they prefer the more straight way.
As I know, in America the empolyer and the employee stand close to each other when they talk and the atmosphere is very comfy, however, in China people consider "the boss is the boss", and the employees usually keep some feet away from their employer to show their respect.
I think why these differences appear is that the different traditional culture of two countries. Chinese are more gentle and implicit than Americans, and Americans prefer showing their feelings and emotions more straight and fast. Like the example of "holding hands" in the second paragraph, girls in China are depended on friends, so they choose this way to show friendship, but girls in US are independent, they are living theirselves' lives. So even though they consider friendship important too, they don't hold hands to show how close they are.
What's more, there are also some similarities between these two ways of nonverbal communication. For example, people shake hands when they meet each other the first time and they hug their long-time-no-see friends to express how much they missed their friends.