.Which statements correctly describe the specialization of labor? Check three correct answers.

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.

This is the belief that a nation must develop and maintain a strong military force in order to pursue and defend its national interests.

This amendment made cuba an american protectorate and forced cuba to cede guantanamo bay to the u.s.