Answer:
Serfs
Explanation:
Slavery became increasingly uncommon through the Middle Ages replaced by serfdom by the 10th century
Meriwether Lewis and William Clark helped open the American frontier to settlement by exploring the regions further out west. They mapped these territories and found accessible routes, so that Americans could move further out west and settle the land before the Europeans could claim it. There was also a smaller objective of studying the science and possible economic qualities.
The answer is auschwitz, birkenau
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