Slavery was now outlawed across the nation, creating a deeper division, is the passing of laws banning slavery in the northern states lead to a more divided nation. Hence, option A is correct.
The development of industry in the northern states. They didn't need slave labour to complete their tasks. Additionally, they despised the practice of bondage. As a result, slavery had to be abolished in the Northern states.
Most white northerners have an inferiority complex against black people. Northern states prevented or slowed down other movements while restricting the freedoms of free African Americans.
Thus, option A is correct.
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