Due to his own life experiences, F. Scott Fitzgerald thought that the American ideal was a cruel mistress who gave everyone the chance to succeed but kept happiness perpetually beyond of grasp.
Fitzgerald contends in this book that the American Dream can never be fully realized because people who believe in it are always trying to improve.
The American dream is about achieving freedom and social mobility via hard work and success. Gatsby's life of crime made him wealthy, but it did not give him freedom or enjoyment. The American dream was something he never managed to achieve.
Thus, F. Scott Fitzgerald thought that the American ideal was a cruel mistress.
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