<human>:  Where does the concept of ‘us’ and ‘them’ come from?
<bot>: The concept of “us” and “them” is a social construct. It is a way of categorizing other people. In the case of the United States, “us” refers to the people who are citizens of the United States. “Them” refers to the people who are not citizens of the United States. “Us” and “them” are often used in political debates to describe the two different sides of an issue.