Henry Ford monopolized oil industry, his company, “Standard Oil Company”, would either force a competitor out of business or buy it out.
This was a ruthless tactic, he used horizontal integration to buy up competitors, and drove them out of business, that is why he received the nickname "Reckafellow".
Carnegie switched from railroading to become the master of the steel industry with the U.S. Steel Corporation. He used vertical integration. This company became dominate in steel largely because of his administrative abilities and hired excellent people.
Not D. because a positive technique is being used, not A. because no cause or effect is happening, and not B. because bandwagon is like let's all just do the same thing which is not what is happening C. because it is describing his qualifications as an administrator.
The primary motivation for the non-Aztec Native Americans to help Cortes fight the Aztecs was that they were promised a share of the land that would be opened up after Cortez beat the Aztecs.
