Duke's father, Washington, had owned a tobacco company that his sons James and Benjamin (1855–1929) took over in the 1880s. In 1885, James Buchanan Duke acquired a license to use the first automated cigarette making machine (invented by James Albert Bonsack), and by 1890, Duke supplied 40% of the American cigarette market (then known as pre-rolled tobacco). In that year, Duke consolidated control of his four major competitors under one corporate entity, the American Tobacco Company, which was a monopoly as he controlled over 90% in the American cigarette market. His robber baron business tactics directly led to the Black Patch Tobacco Wars in 1906-1908.