What is the relationship between the american dream and the social class system by which the united states is stratified?

There is a close relationship between the American dream and the social class system that is stratified because it exists in global and common thinking in people who tend to see reality maintaining the idea that all people have the same possibilities to advance and develop their situation of life and that idea focuses on that these possibilities are achieved in this part of America and is stratified resulting in a close relationship of thoughts.

What area are in blue