What made standard oil a horizontal integration monopoly?

Standard Oil became a horizontal integration monopoly because it owned ninety percent of US oil refineries.

In 1870, John D. Rockefeller and Henry Flagler established the well known American oil producing, transporting and refining company which eventually became a monopoly in Ohio. 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.

the correct option is a

explanation:

the movement mainly consisted of white farmers from the south who sought the relieve of farmers from their hardship. hope this !

by kd

nations must cooperate to bring about and maintain world peace.

nations must not wage wars or commit war crimes in a desire to control other nations.

i think i know which options you have but if these aren't options let me know