What is the significance of the Louisiana purchase?
Napoleon sold it to the United States for pennies per acre, and ended the period of French Colonialism in the midwestern portion of the landmass we now call the continental United States of America.
The Louisiana Purchase was the acquisition by the United States of 828,000 square miles (2,140,000 km²) of French territory ("Louisiana") in 1803. The cost was 60 million francs ($11,250,000) plus cancellation of debts worth 18 million francs ($3,750,000). Including interest, the U.S. finally paid $23,213,568 for the Louisiana territory. Not a bad deal.
We got the port of New Orleans as well as the navigation 'rights' on the Mississippi River and Missouri Rivers. It opened up a vast region that encompasses the current region of 15 states, which comprises around 23% of the territory of the United States today.
Ultimately, division among supporters of this purchase and people who opposed it led to the death of Aaron Burr in a duel with Alexander Hamilton <---- wrong death of Alexander Hamilton in a duel with Aaron Burr) (their animosity towards each other was legendary and directly related to the purchase of the Louisiana Territory).
It opened up a vast area of natural resources as well. And at that time, it started putting pressure on Spain, as Spain claimed ownership of most of the southwest region of our current continental US as well as California and Utah. Once settlers started coming into the Louisiana territory, it was no big leap to move to Texas, where 'gringos' were welcomed as settlers - however, as we know, the Mexican-American War 1845-1849 ultimately led to independence for Texas and eventual admission - even though Mexico and Spain regarded Texas as a rebel colony.....so the problems all interwined....even until the Civil Warl