sentences:  World War II restored prosperity, as industry revived to support the war effort, and good economic times continued into the 1970s.More immigrants were attracted by the promise of middle-class industrial jobs, and in addition to refugees and immigrants from Europe, black Americans and Mexicans also arrived in even larger numbers than they had in the 1910-1930 period.As minority populations exploded in industrial cities like East Chicago and Gary, racial tensions surfaced once again, and white flight from the industrial cities took place, aided in large part by the construction of state and federal highways.