How did john d. rockefeller horizontally integrate his monopoly in 1882? a)he purchased iron mines around the country to add to his business. b)he created a trust that controlled oil wells, refineries, and distribution networks. c)he created a trust that controlled ninety percent of the nation's oil refineries. d)he purchased coal plants around the country to add to his business.

Answer;

B) He created a trust that controlled oil wells, refineries, and distribution networks.

Explanation;

-Horizontal Integration is where Carnegie attempted to buy out competing steel producers. With Horizontal Integration, competing companies merge together. This would give Carnegie control over his suppliers and cutting down on his completion. A Monopoly is when a firm buys out all its competitors.

-By around 1890, Rockefeller's Standard Oil Company controlled 90% of the oil refining business. Rockefeller made HUGE profits by paying his employees very low wages and driving his competitors out of business by selling his vast oil at a lower price than it cost to make it. Once he controlled the market, he would then jack up the prices. This is why he and other tycoons were known as robber barons.