clean cotton coming out of the gin easier to handle, and indoor presses so that cotton no longer had to be carried across the gin yard to be baled. Then, in 1879, while he was running his father's gin in Rutersville, Texas, Robert S. Munger invented additional system ginning techniques. Robert and his wife, Mary Collett, later moved to Mexia, Texas, built a system gin, and obtained related patents. The Munger System Ginning Outfit (or system gin) integrated all the ginning operation machinery, thus assuring the cotton would flow through the machines smoothly. Such system gins use air to move cotton from machine to machine. Munger's motivation for his inventions included improving employee working conditions in the gin. However, the selling point for most gin owners was the accompanying cost savings while producing cotton both more speedily and of higher quality. By the 1960s, many other advances had been made in ginning machinery, but the manner in which cotton flowed through the gin machinery continued to be the Munger system. Economic Historian William H. Phillips referred to the development of system ginning as "The Munger Revolution" in cotton ginning. He wrote, "The Munger innovations were the culmination of what geographer Charles S. Aiken has termed the second ginning revolution, in which the privately owned plantation gins were replaced by large-scale public ginneries. This revolution, in turn, led to a major restructuring of the cotton gin industry, as the small, scattered gin factories and shops of the nineteenth century gave way to a dwindling number of large twentieth-century corporations designing and constructing entire ginning operations." One of the few (and perhaps only) examples of a Munger gin left in existence is on display at Frogmore Plantation in Louisiana. Effects in the United States Prior to the introduction of the mechanical cotton gin, cotton had required considerable labor to clean and separate the fibers from the seeds. With Eli Whitney's gin, cotton became a tremendously profitable business, creating many fortunes in the Antebellum South. Cities such as New Orleans, Louisiana; Mobile, Alabama; Charleston, South Carolina; and Galveston, Texas became major shipping ports, deriving substantial economic benefit from cotton raised throughout the South. Additionally, the greatly expanded supply of cotton created strong demand for textile machinery and improved machine designs that replaced wooden parts with metal. This led to the invention of many machine tools in the early 19th century. The invention of