Which of the following statement best explains why many northern states did not use slaves

Because the people in the northern states could not afford to own slaves .

Explanation: They were poorer than the southern states .

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the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.