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This growth provided an abundance of fresh water and an ample trade route to the Midwestern United States while grooming its economy for the grain , steel and automobile industries that dominated the city 's economy in the 20th century .
 Midwestern United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Midwestern United States