Who wants to do a zoom 70 points just start one and tell me the code

The ancient greek city-state of sparta was run as an oilgarchy, meaning

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.

2. what was the dred scott decision about? what do we learn from this supreme court case?