Answer:
Authors may reference similar stories to compare the similar story to their own story either for sales, or just pure comparison.
It would be it is a primary subject in the story that helps understand the hidden motives of the main character.
Jean Crevecoeur wrote an essay titled "What is an American". The purpose of this essay is to introduce America as a new land to the Europeans who know nothing about America. He describes the differences between America and Europe, the opportunities for employment, the people's freedom and their ability to have a relationship with nature. The reoccurring theme throughout this essay is how good the new land is compared to Europe. He states that it is easier to live in America than under the strict and unfair regimes in Europe
