The city of St. Louis became a major trading hub because of its location near what important geographic feature?

A large, protective mountain range

The meeting point of two major rivers

A vast, flat plain perfect for farming

A natural harbor on the Atlantic coast

The histories of Jamestown and St. Louis both show that a settlement's success is often linked to...

the number of people who live there

Building railroads across mountains

The land is usually higher and safer from floods.

It offers a central point for travel and trade.

The weather in such locations is always mild.

It provides a better defense from attacks.