<span>C. when you want eyewitness information but i'm not positive though i'm sorry.</span>
They were called robber barons and the people was J.P. Morgan<span>, </span>Andrew Carnegie<span>, </span>Andrew W. Mellon<span>, and </span>John D. Rockefeller<span>.</span>
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Generally speaking, it was "B. telephones," that were not used to help create a unified culture in the United States during the nineteenth century, since this did not become popular until later.