what convinced the northern states to abolish slavery?

Question

what convinced the northern states to abolish slavery? it obviously did not have the same effect on the south. identify a historical document that combined no northern states that slavery should be abolished.

Answer 1

Just post that question in your web browser and you'll get thousands of answers. Here's one:

 

https://www.quora.com/Why-did-the-Northern-States-want-to-end-slavery-in-the-first-place

 

Don't know what you mean by "combined no northern states that slavery should be abolished." You probably need to search your text or the web for documents or articles written by people who wanted to abolish slavery. If so, there's a ton of them on line.