The South Improvement Company was a short lived Pennsylvania corporation founded in late 1871 which existed until the state of Pennsylvania suspended its charter on April 2, 1872. It was created by major railroad and oil interests, and was widely seen as part of John D. Rockefeller's early efforts to organize and control the oil industry in the United States under Standard Oil. The company's purpose was to end a rate war with the rail trunk lines by dividing oil traffic more evenly between the Pennsylvania Railroad, the Erie Railroad, and the New York Central railroads. The second purpose of the company was to limit production of refined oil - the country had a daily refining capacity of 40,000 barrels and a market for only 16,000. Although the company never shipped any oil, the South Improvement Company scheme caused widespread attention to be focused on the relationships between big railroads and big businesses which wanted and demanded favorable treatment. In what would become known as the Cleveland Massacre, John D. Rockefeller and Henry Flagler bought eighteen refineries, only one of which wasn't located in Cleveland over a month's time between mid-February and mid-March 1872.