What made Standard Oil a horizontal integration monopoly?

There are several things that made Standard Oil a horizontal integration monopoly, but in general it was the fact that they bought up multiple means of production.

American business leaders who owned a normal company. He opened a petroleum refinery and used consolidation to become a monopoly and a trust still. He owned ninety-fifth of oil refineries. The richest man in the United States of America History.

- normal company

- Used spies, bribery, and "trusts" to cover monopoly.

A business strategy during which a business - like a company - tries to shop for out all of its competition. Full consolidation is termed a monopoly. John D. Rockefeller practised consolidation with normal Oils consolidation.