Which dynasty built protective walls along the northern border.

The Great Wall of the Qin Dynasty (221BC-207 BC) was built during the reign of Emperor Qin Shi Huang, along the country's northern border to prevent the invasion of Huns.

The Qing Dynasty of ancient China built the Great Wall of China along the northern border as a way of preventing outsiders from attacking .

Explanation:

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the answer is a the rich and poor get an equal share of the power and wealth

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i don't think it's c or d. i think it's either a or b.

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