After world war 1 the borders of the ottoman empire were reduced to those of TURKEY.
https://en.wikipedia.org/wiki/Partition_of_the_Ottoman_Empire
The astronomical event that represents the great serpent mound is Halley's Comet.
<u>1) along its river because of fertile soil they found </u>
<em>Reason</em>: They found it easier for them not to frequently give water to the plants since it's already next to a river with fertile soil found this will help them grow various crops.
brainliest if u found it helpful~