the reason the northern states allowed slave trade to continue was so they could have laws they wanted passed to be agreed with by the southern states. within doing this, there was a compromise and the northern states agreed to it. so, the slaves we left as property to the plantation owners and northern states didn't have to return run away slaves to their owners.
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The southern states did not agree with slavery so offered runaway slaves homes, food and care.
Northern slavery began to end during the American Revolutionary War. British generals liberated slaves everywhere they fought, provided the slaves would agree to fight with them. This so diminished the slaves in the North, that many northern colonies enacted legislation, offering freedom if slaves fought on the colonists' side. A generation following the Revolutionary War, northern slavery ended for the most part based on fears of a rising black population, and economic reality.
They disagrred on slavery (obviously). They also did not agree politically because at the time, the north was mostly Republicans and the south was mostly Democrats. Lastly, they disagreed on occupations because the Northerners were more interested in factories and manufacturing. The Southerners cared more about agriculture and farming
slavery
it gave them power