Which Robber Baron is known for using horizontal integration to monopolize oil?

• A. Andrew Carnegie
• B. Eugene V. Debs
• C. John D. Rockefeller
• D. Jay Gould

Answer: (C)

John D. Rockefeller is known for using horizontal integration to monopolize the oil industry. His strategy involved consolidating many smaller oil companies into one larger entity, which allowed him to control a significant share of the market. By acquiring these companies, he effectively eliminated competition and created a powerful monopoly. This approach not only increased efficiency but also enabled him to set prices and dominate the oil industry throughout the late 19th century.

In contrast, Andrew Carnegie was primarily associated with vertical integration in the steel industry, focusing on controlling all aspects of production from raw materials to final sales. Eugene V. Debs was a labor leader and founder of the American Railway Union, advocating for workers' rights rather than monopolistic practices. Jay Gould was known for his significant influence in railroad expansion but did not specifically utilize horizontal integration in the same way Rockefeller did in the oil sector. Thus, Rockefeller's tactics and their impact define his legacy in the context of monopolizing oil through horizontal integration.