We, as Americans, are very diverse. Many people from other countries come to America fro opportunities, and other more. For example, long ago, Ireland was in a potato famine. Due to this, Irish people came to America mostly for food. But seriously, there are different reasons why people come to America. Also, differences is a unique word actually. I guess from this question you are talking about different race and people, I guess. But if I am wrong, just tell me in the comments, and I'll fix it. I'll also give you a totally new answer. Above all, our differences actually define US.