In what 2 ways does the American electoral system tend to promote a two-party system?

What method did party bosses use to maintain the power of their political machines?

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 of the following statements described the sons of liberty