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A) A fort was established and many were killed by diseases
Lewis and Clark's expedition was not positive to the native of Mandan village the most devastating epidemic was the smallpox outbreak in the year 1837 killing a lot of people. The epidemic played an important factor in uniting the surviving Mandans and Hidatsa who later engaged in trade, farming and hunting.
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Checks and balances? Did they give you answer choices?
The formation of the Fertile Crescent is a typical alluvial formation. The two large rivers that run relatively parallel have surrounded a piece of land between them before they merge. Both, the Tigris and Euphrates rivers have annual floods. Through this floods, they manage to influence big portion of the lowland area around them. They are depositing each year enormous amounts of fertile deposits, gather along the way with the erosive processes. The accumulation of these fertile deposits has formed very fertile, deep soil, excellent for large scale farming, which was used by the humans that settled there, turned the region into agricultural one, and started to develop a civilization.
