Answer:
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After the unification of China in the beginning of the Qin Dynasty, China's First Emperor, Qin Shihuang, linked the walls of the three northern states (Qin, Zhao, and Yan).
That expansion of slavery was a major problem for the nation
The French and Indian War, which took place between 1754-1763, began due to a conflict between England and France over control of the Ohio River Valley. Both sides wanted the valley so they could expand their settlements into the area.