Found this on google. Hope it helps
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答案:After the first Opium War
The correct answer is water. Since the landscape of this region is mostly desert, Kara Kum and Kyzl Kum, water was the vital source for the civilizations of this region to make settlements and grow crops. Great civilizations of this region were build in the valleys of big river systems.
Hey there,
The reason why Lincoln did this was to make sure that people would see that everyone is made equal weather the skin color is different or not.
~Jurgen