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 deaths of over a million communist soldiers

post-traumatic stress disorder in veterans

accomplishment : zachary taylor’s was a national war hero in his battle in an mexican war

explanation:

he was known as a national war hero for his battles in the mexican war, taylor was elected as the 12th president of the united states in 1849. he led the nation during its debates on slavery and southern secession. after serving only 16 months in office, taylor died from cholera morbus on july 9,