During the neolithic revolution, the need of getting a reliable source out of the resources around was of great importance. Since the resources are scarce, an organization of how to harness the resources was a challenge. This was how the power play of politics and division emerged during that era.
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I think its because they wanted to spread rule to places other countries haven't therefore the would get there first because other countries never thought of that.
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hope this helped.
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I believe your answer should be a.
Making it possible to ship grain and other goods from north to south china...