Why did truman decide to use the atomic bomb? a. he wanted to quickly end the war in the pacific without invading japan. b. he wanted to keep the germans from entering the war in the pacific. c. he wanted to show off the united states' new super weapon. d. he wanted to test the effects of an atomic bomb on a large city.

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.

The 20th amendment, also called the lame duck amendment, decreased the amount of time between the presidential election and the inaugration of the new president. what are the advancements that allowed for this amendment?

How did europeans and africans displace native americans in north america’s predominant peoples?