Final answer:
The largest class in the United States, based on self-description, is the middle class. It represents the majority of the population and has annual household incomes ranging from $25,000 to $100,000.
Step-by-step explanation:
Based on self-description, the largest class in the United States is the middle class. Sociologists generally identify three levels of class: upper, middle, and lower. The middle class consists of the majority of the population, with annual household incomes ranging between $25,000 and $100,000. The upper class represents the highest earners, and the lower class includes those with lower incomes.