Answer:
St. Louis, Missouri, emerged as a commercial giant as a result of steamboat transportation along the Mississippi River in the years before the Civil War.
Step-by-step explanation:
St. Louis is the second largest city in the state of Missouri, located on the Mississippi River on the border with Illinois. In its metropolitan area, it has 3 million inhabitants. The economy of St. Louis is characterized by service, production, trade, freight transport and tourism. In the 19th and 20th centuries, St. Louis was an important trading center and the fifth largest deposit in the United States due to its location on the Mississippi River, as well as a railway connection area due to its location in the middle of the most important cities of the country.