What was most dangerous about signing the declaration of independence

What law allowed the united states to claim uninhabited islands?

What political issue distinguished wendell willkie from franklin d. roosevelt?

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.