Explain the Importance of the Louisiana Purchase Write a paragraph explaining the events leading to the 1803 Louisiana Purchase and why the purchase was significant. Describe the events leading up to the purchase, including the political changes in the Americas that influenced Napoleon's decision to sell the territory. Explain the extent of the purchase and why the Louisiana Territory was important to the economic interests of the United States. Consider how Jefferson's decision to buy the Louisiana Territory was determined by his vision of the future of the United States and the kind of country he hoped would develop. Explain why he felt that he had overstepped his authority as President in purchasing the territory.​