What kinds of information can be learned from a stone projectlie point (think arrowhead)?

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.

Were african-americans allowed to serve in the military in wwi?

How can we stop u.s. military drone strikes from hurting innocent people