Final answer:
The thesis statement should be: The myth about Doubleday was passed down through generations.
Step-by-step explanation:
The thesis statement for the narrative essay about the history of baseball should be:
The myth about Doubleday was passed down through generations.
The thesis statement should be a clear and concise statement that summarizes the main point of the essay. In this case, the essay will focus on the myth surrounding Abner Doubleday's involvement in the invention of baseball and how it has been perpetuated over time.