Question

By the time he was finished, Rockefeller controlled _____of the North American oil supply.

A) 70%
B) 80%
C) 90%
D) 95%

Answer 1

John D. Rockefeller controlled 90% of the North American oil supply by using horizontal integration and aggressive business tactics to dominate the oil industry.

Step-by-step explanation:

By the time he was finished, John D. Rockefeller controlled an overwhelming 90% of the North American oil supply. This dominance was achieved through Rockefeller's use of horizontal integration and the establishment of the Standard Oil Company, which practiced aggressive business strategies, including underpricing products and driving competitors out of the market. By the 1890s, his company controlled a vast majority of the nation's oil refineries, making it one of the most powerful monopolies in American history.