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Westward expansion was greatly aided in the early 19th century by the _____

(Liberation Purchase / Missouri Purchase / Louisiana Purchase) in 1803, which was followed by the Corps of Discovery Expedition that is generally called the _____
(Louise and Cook Expedition / Lewis and Clark Expedition / The Great Trek of Louis and Clark).

User Bellabelle
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Answer:

Louisiana purchase, Louis and Clark expedition

Step-by-step explanation:

in 1803, the us purchased Louisiana from France, which helped to aid westward expansion, and the corps of discovery expedition was led by merriwether lewis and William Clark, which has led to it being known as the Lewis and Clark expedition

User Animekun
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