Rockefeller built the Standard Oil monopoly in the 1870s by cartelizing competing oil refineries, first in Cleveland, then across the country, eventually gaining a 90%market share in refining.

洛克菲勒在19世纪70年代通过将竞争的炼油厂组成卡特尔，首先在克利夫兰，然后在全国范围内建立了标准石油垄断，最终在炼油领域获得了90%的市场份额。