USA; Chicago - The Yards (Great Union Stock Yards of Chicago (also: Union Stock Yard & Transit Company); large corporation of the American meat industry in the New City district. Around the largest slaughterhouse in the world (1865-1971); the American meat processing industry developed (Armor and Company; Swift & Company etc.) The slaughterhouse itself was founded and operated by 9 railway companies and established Chicago's reputation as "hog butcher of the world".The slaughterhouse developed the industrialized production of meat (assembly line production) and was considered a model for Slaughterhouses worldwide.Cattle in fenced enclosures before being slaughtered. In the background the Armor & Company meat factory.Chicago; 1909.