Answered

What did the Louisiana Purchase achieve for the United States? (award) It doubled the size of the country and provided control of the Mississippi River. It prevented a western attack on the United States by Spain. It improved relations with England and Canada and prevented Indian invasions. It stimulated the economy and strengthened the alliance with France.



Answer :

Gibbs
The Louisiana Purchase helped to double the size of the country and provided control of the Mississippi River. The Louisiana Purchase was a massive land purchase by the U.S. from France under President Thomas Jefferson's administration. 

I believe the answer is: It doubled the size of the country and provided control of the Mississippi River.

Prior to louisana purchase, the united states territory only extended from new hemisphere to Tennsesse. In 1803, the louisiana purchase from the French was being done as an effort to both increase the agricultural fields in the country and additional water route for water transportation.