how did john d. rockefeller affect competition in the oil - refining business?\nhis company controlled…

how did john d. rockefeller affect competition in the oil - refining business?\nhis company controlled almost all us oil refining.\nhe worked to increase competition in the oil - refining business.\nhe helped to increase competition among oil refiners.\nhe helped to establish the federal trade commission.\nhis company pioneered ways to protect free trade.
Answer
Brief Explanations:
John D. Rockefeller's Standard Oil Company used various tactics to gain a near - monopoly in the US oil - refining business, controlling almost all of it. He did not work to increase competition, nor did he help establish the Federal Trade Commission (which was more about general anti - trust and consumer protection), and his actions were not about protecting free trade in the positive sense as his company was creating a monopoly.
Answer:
His company controlled almost all US oil refining.