What is a secondary argument the author makes?

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Read the following passage: Stories have been a part of the world since the beginning of recorded time. For centuries before the invention of the printing press, stories of the world were passed down to generations through oral tradition. With the invention of the printing press, which made written material available to wide ranges of audiences, books were mass-produced and introduced into greater society. For the last several centuries, books have been at the forefront of education and entertainment. With the invention of the Internet, reliance on books for information quickly changed.... Show more

What is a secondary argument the author makes?