Why was Thomas Jefferson so eager to acquire the Louisiana territory?

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ASBTV

History 
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Links to Primary Sources Page 4
🔵 Period 1, 2, 3, & 5 must cite 2 documents w/ in text citations using MLA
🔷 Period 4 must use 4 
Letter to Monroe (November 1801)
Letter to Monroe (January 1803)
Letter to Congress (January 1803)
Instructions to Lewis (June 1803)
Message to Congress (October 1803)
Letter to Priestly (January 1804)