Strong cavalry: The Confederate cavalry was generally considered to be superior to the Union cavalry. This was due in part to the fact that many Southerners were experienced horsemen, and also to the fact that the Confederate cavalry was often led by more aggressive and innovative commanders. Confederate cavalry generals such as JEB Stuart were able to harass Union supply lines and cut off communications, which greatly hampered the Union war effort.
Motivation: Many Confederates were fighting for their homes and way of life, and this gave them a strong motivation to fight. This was especially true in the early years of the war, when the Confederacy was winning most of the major battles. As the war dragged on, however, Confederate morale began to decline, especially after the Union victory at Gettysburg in 1863.
It's important to note that the Union also had some advantages over the Confederacy. For example, the Union had a much larger population and industrial base, which gave it a significant advantage in terms of resources. The Union also had a more centralized government, which made it easier to coordinate its war effort. Ultimately, it was these advantages that allowed the Union to win the war.