Question

What geographic factor enabled St. Louis, Missouri, to become a major urban center by the mid-1800s?

A.
Industries could use St. Louis' underground rivers to process goods without polluting the air.
B.
The city's location near the Mississippi and Missouri Rivers made it a good for trade.
C.
It was near enough to Cahokia for the settlers to trade easily with the Native Americans.
D.
At that time, St. Louis was located exactly in the middle of the United States' land.

Answer 1

Answer B, "The city's location near the Mississippi and Missouri Rivers made it a good for trade."

Step-by-step explanation:

Access to the waterfront made for great trade routes, which in turn led to shipping ports, high revenue generation and more. A whole chain reaction of good things due to the waterfront advantage.