Answer:
The Mongols were a nomadic people from the steppes of Central Asia. Known as fierce horsemen and warriors, the Mongol clans were united in 1206 by the powerful chief Temujin, later known as Genghis Khan.
The answer is C.) parts could be replaced on a machine without replacing the entire machine
In 1838 and 1839, as part of Andrew Jackson's Indian removal policy, the Cherokee nation was forced to give up its lands east of the Mississippi River and to migrate to an area in present-day Oklahoma the Cherokee people called this journey the "Trail of Tears" because of its devastating effects.
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One reason conquistadors failed to establish colonies is that the Natives kicked them out. Many of the aboriginal people were very powerful and could easily get rid of the conquistadors.
Conquistadors could also run out of resources. Nothing lasts forever, and if they couldn't obtain enough resources while exploring and settling it would be hard to establish a colony easily.
There could also be dangerous things that could hinder the settlements such as wild beasts, natural events, and diseases.
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