What was the significance of the Louisiana Purchase? *not just geographic

The Louisiana purchase was significant for the changes it made to the U.S. in addition to the events that led to the sale. France headed by Napoleon regained control of the Louisiana territory in 1800. Napoleon aimed to create an empire in North America, but France was put in a desperate situation after a failed campaign to recapture Saint-Domingue abroad and early signs of war with the United Kingdom at home.
When in 1803 President Thomas Jefferson sent diplomats to purchase the port of New Orleans, France instead offered the entire Louisiana territory. A purchase which cost $15 million and added 828,000 square miles to the United States. At just around four cents per acre, Jefferson had doubled the country.
Thomas Jefferson faced pushback from Federalists. They argued that the Constitution gave the president no right to expand the country. Jefferson defended his decision, citing his powers to make treaties as enough to justify the purchase. This would set a precedent, as future presidents would also wield implied powers from the constitution.
The Louisiana purchase increased America’s size and added substantial wealth in the form of natural resources. The port of New Orleans was secured, a major pathway for American trade. Economic opportunities opened for American settlers, and the political landscape of the United States was changed with the creation of more states.
FURTHER READING:
http://www.ushistory.org/us/20c.asp

The Louisiana Purchase was a significant event in the expansion of the US territory. It also gave the US economy a boost by giving the federal government control of the Mississippi River, which borders 10 states: Minnesota (its origin point), Wisconsin, Illinois, Iowa, Missouri, Arkansas, Kentucky, Tennessee, Mississippi, and Louisiana.
The Louisiana Purchase also allowed the United States to attain control of New Orleans, which at the time was the largest port city in the South and arguably its most important. The ability to control the waterways of Louisiana, especially New Orleans, allowed plantation owners to transport their crops. This allowed the southern states like Mississippi, Tennessee, Louisiana, and others to contribute to the nation's GDP.
However, the advantages that the United States gained in the Louisiana Purchase were not all about addition. The United States' power also increased through subtraction—in this case, the minimization of France's territory in the United States.
https://www.nps.gov/jeff/learn/historyculture/upload/louisiana_purchase.pdf