Which two new countries were born in the 1870s?

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.

Plz the 10 places that charles darwin stopped at to report his findings, and include dates?

How did farm families get things they needed, such as cloth, in the mid-1800's