What would have happened if Thomas Jefferson had not purchased the Louisiana territory?

Had Thomas Jefferson not purchased the Louisiana Territory, the United States would have faced significant limitations in its westward expansion and economic growth. The absence of this vast land acquisition could have allowed European powers, particularly France or Spain, to maintain influence in North America, potentially leading to conflicts over territory. Additionally, without the resources and land from the Louisiana Territory, the U.S. might have struggled to establish itself as a continental power, altering the nation's development trajectory and its role in global affairs.