Which of the following was a key to the North winning the Civil War? The North had a larger population, more food supplies, and greater manufacturing capacity. General Robert E. Lee was a gifted tactician and an experienced commander. The Nothern move to control the Mississippi River was immediately successful. General McClellan emphasized careful and lengthy planning and preparation.

The correct answer is: " The North had a larger population, more food supplies, and greater manufacturing capacity"

Historians have debated widely about the Confederate's chances of winning the war. Most scholars emphasize the fact that the Union had an insurmountable advantage over the Confederation in terms of technological development and population. The confederated actions only served to delay the defeat.