What is particularly unique about the United States middle class?

a. It is the smallest class in the United States.

b. It is broken into two subcategories: upper and lower middle class.

c. The people who are middle class often have little to no education.

d. The upper class are as likely to become members of the lower class as members of the lower class are likely to become members of the upper class.

Answer: What is particularly unique about the United States middle class?

b. It is broken into two subcategories: upper and lower middle class.

Explanation: The unique thing about United States middle class is that it comprises of both lower and upper middle class which are:

1. The lower middle class is often made up of less educated people with lower incomes, such as managers, small business owners, teachers, and secretaries.

2. The upper middle class is often made up of highly educated business and professional people with high incomes, such as doctors, lawyers, stockbrokers, and CEOs.