Slavery in the North was surely much "milder" in the North than South. The Northerners were not more humane than Southerners but their point of view to the slaves was different. There are many reasons for this.
First, the Northerners were more concerned about civil rights. The working conditions of the factory workers in the North were as bad as the working condition of the slaves. The North was more industrialized than the South. So factories were very common in North. As the number of factories increased, the people who worked in the factories increased as well. …
