Answer:
The North had far more men.
Step-by-step explanation:
Not only was the South unable to replenish its economic infrastructure, but it could not maintain a strong army. Mounting casualties drained the Confederacy of its manpower. Not counting slaves, the South could only boast about 6 million people, compared to more than three times that in the North.
This was part of the reason Robert E. Lee risked invading the North.
He realized the Confederacy could not continue fighting forever.