Answer: In the Treaty of Paris, the British Crown formally recognized American independence and ceded most of its territory east of the Mississippi River to the United States, doubling the size of the new nation and paving the way for westward expansion.
Well, I would have refrained more from attacking to not cause any troubles but assist my allies as they are fighting their enemies. Also, I would have gained more dominance over the small countries before going for the big ones.
If you're talking about the time when the North was more urbanized than the South, some factors are industrialization (more jobs) and less hostility faced in the North.
