What do you think would be more effective in discouraging a Xiongnu invasion, walls or a large Chinese population along the border? Explain your thinking?

A large Chinese population along the border

Explanation:

Xiongnu was known for its war with China and occasional invasion. They knew the importance of horses in military and usually targeted them.

However Xiongnu invasion will be discouraged if a large Chinese population are at the border.

This is because they will be unable to get to where pastures, farm animals which were their main targets.

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