What is the main idea of this excerpt from an article in the U. S. Constitution?

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.

What impact did the gi bill and the interstate highway act of 1957 have on the development of the suburbs

Which of the following would be the most immediate effect of sanctions on a country?