Question

Which country was the Louisiana Territory purchased in 1803?

Answer 1

The territory's boundaries had not been defined in the 1762 Treaty of Fontainebleau that ceded it from France to Spain, nor in the 1801 Third Treaty of San Ildefonso ceding it back to France, nor the 1803 Louisiana Purchase agreement ceding it to the United States.
Louisiana Purchase - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Louisiana_PurchaseWikipedia

Answer 2

The Louisiana Purchase (1803) was a land deal between the United States and France, in which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi River for $15 million.
Louisiana Purchase | Thomas Jefferson's Monticello
https://www.monticello.org/site/jefferson/louisiana-purchaseMonticello