Maybe southern troops were, in general, willing to endure more hardships or fight a little harder because they felt they had more personally at stake than most northern troops. The southern army certainly had generally much better battlefield leadership. The southern troops themselves had a lot of respect for Yankees from the midwestern states, who tended to be farm boys just like them, and equally hard to handle.
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The Union states were able to raise a much larger army than the Confederacy because the Union had far more people. More than twice the inhabitants of America resided in the northern states.
The Union had far greater industrial production than the Confederacy, in many ways this helped the Union, not the least of which was in weapons production. Another way this helped were the quantity of textile mills that could produce supplies for soldiers.
The Confederacy
It depends on which side union or confederacy. The union had it probably worse than the confederacy. The union would mostly sometimes meet the Confederacy on their territory that's how the Confederacy won part of their victories b knowing their territory around them. A average solider can walk up to 30-40 miles in a day!
Union - though most Unionists were never Abolitionists