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MAP ACTIVITYMap 23.1 Auto Manufacturing By the mid-1920s, the massive coal and steel industries of the Midwest had made that region the center of the new automobile industry. A major road-building program by the federal government carried the thousands of new cars produced each day to every corner of the country.READING THE MAP: How many states had factories involved with the manufacture of automobiles? In what regions was auto manufacturing concentrated?CONNECTIONS: On what related industries did auto manufacturing depend? How did the integration of the automobile into everyday life affect American society?