Before establishing the nobel prize in 1896, what was inventor alfred nobel's defining creation?

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 county could deny african americans the right to attend white schools on the basis of

Which economic sector employs the least number of people in mexico, barbados, and venezuela? a. agriculture b. services c. industry