Answer:
Standard Oil became a horizontal integration monopoly because it owned ninety percent of US oil refineries. It became a monopoly because it bought almost all of the competitors so that it managed to control almost all oil production, processing, marketing, and transportation in the United States.
I believe it is horizontal and vertical integration.
The correct answer for the question is Income tax
Answer: (C) Mexico
Explanation: This is definitely the right answer. Brainliest please.