Jefferson ultimately ended up purchasing the entire Louisiana territory by the Louisiana Purchase in 1803. The United States gained 15 of the present states and was very important for growing the country.
France had these territories before the United States did and Jefferson wanted to buy them. Although Napoleon declined at first, France soon needed money in order to pay for the Great French War. He sold these territories to the United States. This was crucial for the expansion of the country.
The United States still did not have all of the present land we have today, but the Louisiana Purchase doubled the amount of land available to expand and explore.
