Given that the other answer disagrees, I will impart to you why we should agree with Jefferson's purchase of the Louisiana Territory.
There are a number of reasons, either forseeable, or hidden in the dark in our purchase of the Louisiana Territory, which by no means almost bankrupted our nation.
1) The US had been largely under the influence of the policy of expansionism, in which the subset of this was later known as the manifest destiny. The US had already overpopulated their original 13 colonies, and had started spilling westward, much to the displeasure of the Native American tribes, which were promised by the British government that the expansion westward would be reigned in. In buying the Louisiana Purchase, the US would in turn be able to accomplish their manifest destiny, as well as open millions of acres of land for people to settle on.
2) The Louisiana Territory Purchase actually helped strengthen US and French relationships, particularly with the Napoleon administration. These much needed funds were used to in turn by supplies for France's military, and the land was in turn given for the US to distribute their population through population density.
3) The Louisiana Territory opened up the US to a what is known as prairies, or semi-dry grasslands that gain adequate amounts of rainfall and sunlight that sustained farming, which in turn could be used to sustain the growing population.
4) The settlement of these lands in an early age actually allowed for even more people to move westward later on during the gold rush era, in which thousands of people were able to travel from one city to another before embarking on the journey to the unknown. If they did not buy the Louisiana Territory, they would have needed to sooner or later, or else risk war with France with thousands of US citizens trespassing the country. In turn, the purchase was a benefit for both countries.
So yes, President Jefferson's purchase of the Louisiana Territory was justified, and was an important step for the US to become what we know of it today.
