The Louisiana Purchase in 1803 was extremely important to the United States because it dramatically expanded the size of the country. It essentially doubled the size of union. It was also acquired peacefully rather than through warfare.
It almost doubled the land owned by the US and provided more materials.
Explanation:
There are a lot of reasons why it was important, but these are two. Also, you might want to check my answers, I learned about the Louisiana purchase last year.
