What progress was made toward world peace in the 1920’s?

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.

Wich part of the declaration of independence acts as an implied plan of action in that it lists laws and practices to be changed

Which of these effects of mass production techniques used during 1920