In what century did the roman empire collapse?

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.

The irish and germans of the 1840's were part of the new immigration. true or false

Which of the following are examples of limited resources on the part of consumers?