Why were the the battles of saratoga and yorktown important

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 could have been done to stop the illegal voting? what about the violence?

Of the following, who would be the least affected by the telegraph? eastern industrialists western businessmen city dwellers native americans