The document summarizes the history of ownership and acquisition of the Louisiana Territory by various nations including Native Americans, French, British, Spanish, and Americans. It describes how France gained control of the territory in 1682 but lost it to Spain in 1763. In 1800, Spain secretly transferred the territory back to France under Napoleon, alarming Thomas Jefferson. Jefferson sent diplomats to purchase New Orleans but Napoleon unexpectedly offered to sell the entire Louisiana Territory for $15 million. In 1803, the United States completed the Louisiana Purchase, doubling the nation's size and opening vast new lands for settlement and exploration like the Lewis and Clark Expedition.