You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did the us buy the louisiana territory?" whose answer is 1803.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the us buy the louisiana territory
Useful Output:

Doc 1: The Louisiana Purchase was a land deal made in 1803, in which the United States purchased 828,000 square miles (2,144,510 km²) of land west
Doc 2: Thomas Jefferson negotiated a treaty with France in which the United States paid France $15 million for the Louisiana Territory – 828,000 square miles of land
Doc 3: Then, to add fuel to the fire, Spain revoked the rights of shipping, passage, and storage at New Orleans for the United States in 1802. It was
Doc 4: The Louisiana Purchase, an 1803 land deal between the United States and France, doubled the size of the United States and made the future state of Missouri a
Doc 5: In this transaction with France, signed on April 30, 1803, the United States purchased 828,000 square miles of land west of the Mississippi