How did John D. Rockefeller horizontally integrate his monopoly in 1880? A.)He purchased iron mines around the country to add to his business.
B.)He created a trust that controlled ninety percent of the nation's oil refineries.
C.)He created a trust that controlled oil wells, refineries, and distribution networks.
D.)He purchased coal plants around the country to add to his business.

Why did the united states become involved in the soviet-afghan war? the united states wanted access to the afghan oil fields. the united states wanted to retaliate against the soviet boycott of the 1984 olympics in los angeles. representative charlie wilson convinced congress to fund afghan resistance to soviet influence. president ronald reagan wanted to force the soviets to withdraw from afghanistan.