What were two ways in which the democratic-republicans changed the federalist programs?

Who needed protection from railroads

American troops were worried about cantracting in cuba a. yellow fever b. hepatitis c. polio

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.