Hurry up plzzz as a result of economic growth during the 1950s, the percentage of americans who were in the middle class

increased slightly.

increased greatly.

decreased slightly.

decreased greatly.

Which plan proposed to maintain open trade between china and western nations? open door policy national sovereignty missionary diplomacy salutary neglect

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.

Why caused john quincy adams to write the monroe doctrine?