What was the emancipation proclamation and how did this impact british diplomacy?

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.

Choose the option that best completes this statement: the british and the continental system were blockades that prevented the united states from trading with without extreme risk to ships, goods, and sailors.

What is a characteristic of hunter-gatherer societies?