The answer is B.
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it is I and III :> hope thia helps
Answer:
The Lewis and Clark Expedition happened after the Lousiana Purcahse in 1803.
Explanation:
The Lousiana Purchase is the US government purchasing a big chunk of today's middle US territory from France, and since the territory is still unknown, President Jefferson decided to sent a search party to go for an expedition to learn about the natural environment and geography.
Their route is shown in the image below.