Select the four countries that made claims on parts of the oregon territory. mexico spain russia canada great britain united states

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.

According to the map, most mining occurs in the a.northern b.southern c.eastern d.western

How was the u.s. economy different from european economies following world war 1?