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.

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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increased food supply

improved public health

increased birth rates

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