Final answer:
The commercial zone for St. Louis City extends up to 25 miles beyond the city limits.
Step-by-step explanation:
The commercial zone for St. Louis City extends up to 25 miles beyond the city limits.
According to the information provided, St. Louis was an important trade headquarters in the northern Mississippi Valley and the Greater West. It had a significant influence on the surrounding regions. The southern border of Missouri (at latitude 36° 30') marked the boundary for slavery, with some exceptions including Missouri.
Therefore, considering the historical significance and trade influence of St. Louis City, it can be inferred that the commercial zone extends a significant distance beyond the city limits, possibly up to 25 miles.