What were the immigrants living conditions like when they moved to America ?

Based on this graph, it is reasonable to assume that by 1930 the percentage of the population with the right to vote was

Round arches allowed the romans to create structures with

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.