Founding and early growth
Rockefeller c. 1872, shortly after founding Standard Oil
By the end of the American Civil War, Cleveland was one of the five main refining centers in the U.S. (besides Pittsburgh, Pennsylvania, New York, and the region in northwestern Pennsylvania where most of the oil originated). By 1869 there was triple the kerosene refining capacity than needed to supply the market, and the capacity remained in excess for many years.[59]
On January 10, 1870, Rockefeller abolished the partnership of Rockefeller, Andrews & Flagler,[60] co-founding Standard Oil of Ohio. Continuing to apply his work ethic and efficiency, Rockefeller quickly expanded the company to be the most profitable refiner in Ohio. Likewise, it became one of the largest shippers of oil and kerosene in the country. The railroads competed fiercely for traffic and, in an attempt to create a cartel to control freight rates, formed the South Improvement Company offering special deals to bulk customers like Standard Oil, outside the main oil centers. The cartel offered preferential treatment as a high-volume shipper, which included not just steep discounts/rebates of up to 50% for their product but rebates for the shipment of competing products.[61]