What was the core business that made the standers oil a horizontally integrated monopoly

Carnegie introduced the Bessemer process, which decreased the cost of production. What made Standard Oil a horizontal integration monopoly? It owned ninety percent of US oil refineries.

Explanation: Hope i helped you~! <\3

the hyksos invasion. the hyksos were able to attack egypt successfully because of their skills in using bronze weapons, composite bows and the use of the horse and chariot during the invasion. although the egyptians depict a barbarian-type overthrow, the truth is the seizure was likely a relatively peaceful one.

the tallest building in the western hemisphere and the sixth tallest building in the world