What was the geographic impact of tobacco during the Columbian exchange?

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.

How did americans disagree over the role of federal and state goverment before and durning the civil war

Under the new imperialism europe did not need large numbers of people to control territories because of