The author's purpose made the text focus on how Cornelius Vanderbilt made his fortune.
As the author's goal was to show how successful Cornelius Vanderbilt was, he shaped the content of the text to focus on information about how Cornelius Vanderbilt gained his wealth.
As such, he placed little emphasis on off-target information, such as Cornelius Vanderbilt's childhood and family.
More information what are biographies at the link:
https://brainly.com/question/7015699