Rockefeller was an abolitionist who voted for President Abraham Lincoln and supported the then-new Republican Party.[46] As he said, "God gave me money", and he did not apologize for it. He felt at ease and righteous following Methodist preacher John Wesley's dictum, "gain all you can, save all you can, and give all you can."[47] During the Civil War, military consumption of oil drove the price up from $.35 a barrel in 1862 to as high as $13.75.[48] This created an oil-drilling glut, with thousands of speculators attempting to make their fortunes. Most failed, but those who struck oil did not even need to be efficient. They would blow holes in the ground and gather up the oil as they could, often leading to creeks and rivers flowing with wasted oil in the place of water.[49]
A market existed for the refined oil in the form of kerosene. Coal had previously been used to extract kerosene, but its tedious extraction process and high price prevented broad use. Even with the high costs of freight transportation and a government levy during the Civil War (the government levied a tax of twenty cents a gallon on refined oil), profits on the refined product were large. The price of the refined oil in 1863 was around $13 a barrel, with a profit margin of around $5 to $8 a barrel. The capital expenditures for a refinery at that time were small – around $1,000 to $1,500 and requiring only a few men to operate.[50] In this environment of a wasteful boom, the partners switched from foodstuffs to oil, building an oil refinery in 1863 in "The Flats", then Cleveland's burgeoning industrial area. The refinery was directly owned by Andrews, Clark & Company, which was composed of Clark & Rockefeller, chemist Samuel Andrews, and M. B. Clark's two brothers. The commercial oil business was then in its infancy. Whale oil had become too expensive for the masses, and a cheaper, general-purpose lighting fuel was needed