Final answer:
In the United States, society is stratified into social classes based on wealth, education, and occupation, with the common three-tier structure being the upper, middle, and lower classes.
Explanation:
In the United States, society is stratified into social classes based on various factors like wealth, education, and occupation. While there can be as many as twelve class levels proposed by social scientists, a common model recognized by many Americans is the three-tier structure comprising the upper, middle, and lower classes. Social mobility describes the shift from one social class to another, and class traits define behaviors and norms of each class.
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