Who wrote more than one hundred books expressing the idea of individualism in american society?

I believe the answer is: horatio alger

Horatio alger was known for his writings that mostly depict the struggle of people who came from  lower class background who managed to achieve success and climb their way up through dedication/determination. He promote the idea of individualism that in order to achieve greatness, a person must be willing to let go of everything that shackles them, including their social lives.

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