How did the rise of big business change social classes in the United States?

You are to write a narrative introducing your ideas or reactions, backed with evidence, and a conclusion. You must provide critical analysis of the readings and not simply a restating of the facts the authors present. Use only the book as resource- Of the People:  A History of the United States, Volume 2:  Since 1865 Fourth Edition. I do not have the book yet, so if you can help me with that.