Answer :
It would have been difficult to maintain the level of Southern food production during the Civil War, let alone increase it, because the South relied on a slave labor system against an opponent that was actively fighting for the freedom of slaves. As enslaved peoples rarely enjoy being enslaved, many in the South fled to Union lines as they approached which continuously weakened the productive capabilities of the South.
The reason that the South could not maintain its high level of food production was that a lot of its farmers had to join the war effort.
Agricultural labor in the South
Even though the South had relied on a lot of enslaved labor, not many people actually owned enslaved people or used them for work.
When the war broke out therefore, the farmers who were the backbone of agriculture in the South, had to join the war which reduced labor for farming. This therefore reduced food production capabilities.
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