South Chicago was bustling with waves of immigrants as the popularity of the World's Columbian Exposition of 1893. The steel mill became U.S. Steel South Works in 1901, continuing to attract immigrants from Ireland, Eastern Europe, Scandinavia and Italy. During the 1950s many residents called the northeast section of South Chicago *"The Bush" and worked in the local massive steel mill, US Steel. Others worked in neighboring steel mills such as Youngstown Steel, Republic Steel, Bethlehem Steel, and LaSalle Steel. At its zenith, South Chicago helped make the Chicago metropolitan area the leading producer of steel products in the nation. The Willis Tower and the Hancock Building were built from South Chicago steel. The embers, (graphite) from the smokestacks would cause the cars and sidewalks to sparkle and created a golden glow throughout the night. Softball and bowling were popular pastimes. Large Polish weddings on Saturdays were also a common sight.