Possibly.

It was possible the South could have won the war. One reason was because of their home-field advantage, with this the South would have knowledge ranging from knowing where to plan attacks like small surprise attacks to finding the nearest river for resources. Another important key aspect the South had was their better generals. The Confederacy's generals would have better battle strategies and have the battle go more according to plan. Unlike the Union's generals who made too many mistakes where it led to Lincoln firing many of them. Since most of the military schools were located in the South, most of the students joined the army against the Union so the Confederacy had more experienced soldiers than the Union. Also, even if the South had lost a battle they would jump back to their feet with their determination to win. While the North's army would always think to themselves what the reason was for fighting. The soldiers fighting against the South would often write in their journals wondering if it was about slavery or another reason. Throughout the war, the South had better strategies in the war that would take less time like they thought would.  May I remind you, the North's Anaconda Plan would have taken far too long and would prolong the war. In my opinion, if the South was able to gain the support of France or Britain they would have won the war. It would be just like a replay of the 13 colonies against Britain. It was the same dilemma. Riddle me this, if a similar event happened before, couldn't history repeat itself?