In terms of the advantages and disadvantages of the North and South, it is difficult to say which side would have been predicted to win the Civil War. Both sides had their own strengths and weaknesses, and the outcome of the war was determined by a combination of military strategy, political will, and other factors.
That being said, two advantages that helped the North the most were their larger population and more diverse economy. The North had a larger pool of potential soldiers, and they were able to manufacture weapons and supplies more efficiently than the South. The North also had a more diverse economy, which helped them weather the economic strain of the war better than the South.
Another advantage that helped the North was their control of the seas. The Union navy was able to block Southern ports, which limited the South's ability to trade and receive supplies from other countries. This was a significant disadvantage for the South, as they relied heavily on exporting cotton and importing goods from Europe.