When you are sitting in the hall and you hear something fall

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.

How does the concept of competition relate to the arms race between the us and the soviet union during the cold war?

In 1819, what did the united states obtain from spain for $5 million?