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During the twentieth century , the city 's economy experienced a downturn , first due to the replacement of steamboat traffic on the Mississippi River by railroads in the early 1900 s , some of which bypassed the river cities and drew away their commerce .
 location: Mississippi River
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Mississippi River