Half Broke Horses : Analyze the novel .What is the major theme(s) in the novel? How does the author arrive at it, and how does this theme/theme(s) affect or shape the main character?

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Half Broke Horses’ by Jeannette Walls.

Analyze the novel .What is the major theme(s) in the novel? How does the author arrive at it, and how does this theme/theme(s) affect or shape the main character?