The author organizes the essay "Horatio Alger and his American Dream" by:
1. Chronologically following his life and development as a writer and ending with his legacy today.
In this structure, the essay would start by providing a brief biography of Horatio Alger, then discuss his career as a writer, highlighting his success and challenges. The essay would progress through the stages of his life, detailing how he evolved as a writer and the impact of his works. Finally, it would conclude by examining his legacy in contemporary times, discussing his enduring influence and relevance.
This chronological approach helps readers understand the progression of Alger's life and career, enabling them to appreciate how his experiences shaped his writing and his lasting impact on American literature.