Meriwether Lewis
| Spring
Lewis, now picked as commander, is sent to Philadelphia for instruction in botany, zoology, celestial navigation, medicine from nation’s leading scientists. Also begins buying supplies to outfit the expedition.
Lewis writes to former army comrade, William Clark, inviting him to share command of expedition. Clark writes to accept.
July 4
News of Louisiana Purchase announced. For $15 million, Jefferson more than doubles the size of United States: 820,000 square miles for 3 cents an acre. The next day, Lewis leaves Washington.
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