What did tribes spread out from Africa?

In 1912, the imperial system that had ruled over china for thousands of years

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.

What side of the american civil war would you choose to fight for and why