Question

why did the northern states want to establish slavery​

Answer 1

Abolition became a goal only later, due to military necessity, growing anti-slavery sentiment in the North and the self-emancipation of many people who fled enslavement as Union troops swept through the South.

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Answer 2

Answer:

because...

Explanation:

Lincoln and other northern politicians needed a reason to substantiate fighting the South; slavery was the perfect choice.

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