Answer:
It made it easier for cities along the Mississippi River to trade with cities on the East Coast and in other countries.
Step-by-step explanation:
The Louisiana purchase was a transaction between United States and France. At that time, Louisiana territory is located in the middle of the continent. It separates the western and eastern part of united states.
Whenever Traders from The Mississippi river (which located on the western part) area wanted to trade with the area on the eastern part, they have to pay some sort of tariffs for the French government in order to pass.
Purchasing this region eliminate the need for those traders to pay the tariffs. Not only that, they also gained easier access to trade with other countries such as Canada and Mexico.