What did John D. Rockefeller do to establish Standard Oil as a monopoly? O kept discovering oil
O set up a trust
O bought stock options
o invested in banks
Please help

Due to what conditions were slaves brought into brazil to work the fields? the climate was similar to that of africa. the indigenous workers were hired as managers. the indigenous workers had died from exposure to diseases from europe. slaves from africa were already used in other regions and brazil was the next location.