1) what made standard oil a horizontal integration monopoly? a- it controlled all aspects of oil productions b- it owned ninety percent of us oil refineries c- it formed a trust d- it operated all across the united states a is wrong 2) the cleveland massacre was a- a takeover by standard oil of the refineries in cleveland b- a labor dispute at standard oil in cleveland that turned violent c- an attempt to stop standard oil from becoming a monopoly d- a failed attempt by standard oil to take over other refineries a is correct 3) which company was a monopoly during the gilded age? a- microsoft b- at& t c- allegheny steel d- carnegie steel d is the answer 4) how was rockefeller able to build his monopoly across the oil industry? a-