sentences:  Completed for the Union Stock Yards Company of Omaha in May 1926, the Livestock Exchange Building was the most significant structure associated with the Omaha Stockyards and served as the center of the livestock industry in Omaha.Chicago and Omaha were the two largest centers for livestock processing in the nation, and the industry was the most important in the city.In 1957 the stockyards and meatpacking industry employed half the workforce of Omaha.