Help quickly please...

Which indo european tribe developed a strong warrior society and built an empire that was frequently invaded by those seeking fertile land

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.

Which piece of legislation granted african americans the right to vote