Today, does the united states have a system of social classes ?

Sociologists disagree on the number of social classes in the United States, but a common view is that the United States has four classes: upper, middle, working, and lower. Further variations exist within the upper and middle classes.

Explanation:

the answer to number 5 is fort sumter

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.