When Flagler envisioned successes in the oil industry, he and Rockefeller started building their fortune in refining oil in Cleveland, Ohio. Cleveland became very well known for oil refining, as, "More and more crude oil was shipped from the oil regions to Cleveland for the refining process because of transportation facilities and the aggressiveness of the refiners there. It was due largely to the efforts of Henry M. Flagler and John D. Rockefeller." Flagler and Rockefeller worked hard for their company to achieve such prominence. Henry explained: "We worked night and day, making good oil as cheaply as possible and selling it for all we could get." Not only did Flagler and Rockefeller's Standard Oil company become well known in Ohio, they expanded to other states, as well as gained additional capital in purchasing smaller oil refining companies across the nation. According to Allan Nevins, in "John D. Rockefeller" (p 292), "Standard Oil was born as a big enterprise, it had cut its teeth as a partnership and was now ready to plunge forward into a period of greater expansion and development. It soon was doing one tenth of all the petroleum business in the United States. Besides its two refineries and a barrel plant in Cleveland, it possessed a fleet of tank cars and warehouses in the oil regions as well as warehouses and tanks in New York."