How did Cheswell pave way for future black government officials?

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.

According to the map, most mining occurs in the. part of the state

All state and federal officials are required to take an oath to support the constitution. select the best answer from the choices provided t f