In what order does a dynasty gain and lose power in the Mandate of Heaven?

How did the economy in the 20’s lead to the florida land boom.

Was the us justified in using the atomic bomb on hiroshima and nagasaki? why or why not?

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.