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How did the Qin dynasty improve safety in China?
The Qin made laws banning foreigners from China.
The Qin built a defensive wall to protect from invasion.
The Qin built seaport walls to defend against foreign raids
The Qin required military training for all Chinese citizens.

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Answer:

The Quin Dynasty were responsible for creating the Great Wall Of China. This wall was ginormous and helped China stay safe from any enemies The Qin built a defensive wall to protect from invasion. B

Explanation:

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