What was the effect of the vietnam war

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.

Describe how father de mora lost the gold

European expansion into africa left native regimes intact but had a strong impact on local societies what does this mean