Around which physical features do we see the lowest population densities. Why might that be?

Mountainous areas with steep slopes and poor quality soil  so they tend to have low population densities.

Explanation:

abraham lincoln issued the preliminary emancipation proclamation on september 22nd, 1862. it stipulated that if the southern states did not cease their rebellion by january 1st, 1863, then proclamation would go into effect.

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