Answer:
The Mongol Empire
Explanation:
The Mongol Empire existed during the 13th and 14th centuries and it is recognized as being the largest contiguous land empire in history! Thank you hope this helps! :)
When it comes to growth during Jefferson, the biggest thing he did was purchase the Louisiana territory from the French. The French wanted to sell the territory to the US and leave that part of the North American continent and the US bought it for various reason. Major reasons were expanding the size of the colonies and preventing the British from trying to take the colonies first.
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The extermination camps were used to hold jews until they are to be gassed. This is known as the Holocaust.