What is an American?

Before I came to United States, I did not know anything about this country even though who was the first president in this country. I heard the word "United States" when I was taking ESL becuase we read the text book of ESL which was almost about American culture or immigration. I could see and hear the word although I did not want to see and hear it. People do not call this country as America becuase there are South America and North America, so this country is called as United States. Also, people who live in this country are called as Untied States citizens.
Korea, Japan, and China are called as Asia countries, so I think it is same thing with this country. That means this country is just one of America countries.

People come to this country from other countires to get a better life.I thought only white people lived in this country. However, when I arrived in LA, I could see many people who had differnet skin colors. There are many latin people in my school. Although they are born in this country, they have their own culture except American culture. I think they are affected from their parents. I think it is good because before I came to this country, I did not even know Mexico is,but I could get informations which are about Mexico from my friends.

Namely, although we have different culture, we can share informations and talk about experiences in English. I think the language makes us together. If I think what "United States" means, I can tell the word means different states make together.