What promise did Rockefeller make to Vanderbilt?

• A. To build a new railroad
• B. To guarantee oil for his trains
• C. To invest in his business
• D. To reduce oil prices

Answer: (B)

The promise that Rockefeller made to Vanderbilt was to guarantee oil for his trains. This agreement was significant because it established a mutually beneficial relationship between the two industrial giants. Vanderbilt, who was primarily known for his dominance in railroads, needed a reliable supply of oil to fuel his trains, particularly as the demand for oil grew due to its use in transportation. By ensuring a consistent supply, Rockefeller not only secured Vanderbilt's business but also solidified Standard Oil's position in the market. This strategy allowed Rockefeller to expand his influence and control over the oil industry while significantly benefiting Vanderbilt's operations, as it improved the efficiency and reliability of his railroad services. This collaboration illustrates the interconnectedness of these industrial moguls and how their agreements shaped the landscape of American industry during that era.