Historians have debated whether the Confederacy could have won the war. Most scholars emphasize that the Union held an insurmountable long-term advantage over the Confederacy in terms of industrial strength and population. Confederate actions, they argue, only delayed defeat. Southern historian Shelby Foote expressed this view succinctly: "I think that the North fought that war with one hand behind its back...If there had been more Southern victories, and a lot more, the North simply would have brought that other hand out from behind its back. I don't think the South ever had a chance to win that War." The Confederacy sought to win independence by out-lasting Lincoln; however, after Atlanta fell and Lincoln defeated McClellan in the election of 1864, all hope for a political victory for the South ended. At that point, Lincoln had succeeded in getting the support of the border states, War Democrats, emancipated slaves and Britain and France. By defeating the Democrats and McClellan, he also defeated the Copperheads and their peace platform. Lincoln had also found military leaders like Grant and Sherman who would press the Union's numerical advantage in battle over the Confederate Armies. Generals who did not shy from bloodshed won the war, and from the end of 1864 onward there was no hope for the South.
On the other hand, James McPherson has argued that the North’s advantage in population and resources made Northern victory likely, but not inevitable. Confederates did not need to invade and hold enemy territory to win, but only needed to fight a defensive war to convince the North that the cost of winning was too high. The North needed to conquer and hold vast stretches of enemy territory and defeat Confederate armies to win.
Also important were Lincoln's eloquence in rationalizing the national purpose and his skill in keeping the border states committed to the Union cause. Although Lincoln's approach to emancipation was slow, the Emancipation Proclamation was an effective use of the President's war powers.
The Confederate government failed in its attempt to get Europe involved in the war militarily, particularly England and France. Southern leaders needed to get European powers to help break up the blockade the Union had created around the Southern ports and cities. Lincoln's naval blockade was 95% effective at stopping trade goods, as a result, imports and exports to the South declined significantly. The abundance of European cotton and England's hostility to the institution of slavery, along with Lincoln's Atlantic and Gulf of Mexico naval blockades, severely decreased any chance that either England or France would enter the war.
Comparison of Union and CSA Union CSA Total population 22,100,000 (71%) 9,100,000 (29%) Free population 21,700,000 5,600,000 1860 Border state slaves 400,000 NA 1860 Southern slaves NA 3,500,000 Soldiers 2,100,000 (67%) 1,064,000 (33%) Railroad miles 21,788 (71%) 8,838 (29%) Manufactured items 90% 10% Firearm production 97% 3% Bales of cotton in 1860 Negligible 4,500,000 Bales of cotton in 1864 Negligible 300,000 Pre-war U.S. exports 30% 70%
The more industrialized economy of the North aided in the production of arms, munitions and supplies, as well as finances, and transportation. The table shows the relative advantage of the Union over the Confederate States of America (CSA) at the start of the war. The advantages widened rapidly during the war, as the Northern economy grew, and Confederate territory shrank and its economy weakened. The Union population was 22 million and the South 9 million in 1861; the Southern population included more than 3.5 million slaves and about 5.5 million whites, thus leaving the South's white population outnumbered by a ratio of more than four to one compared with that of the North. The disparity grew as the Union controlled an increasing amount of southern territory with garrisons, and cut off the trans-Mississippi part of the Confederacy. The Union at the start controlled over 80% of the shipyards, steamships, river boats, and the Navy. It augmented these by a massive shipbuilding program. This enabled the Union to control the river systems and to blockade the entire southern coastline. Excellent railroad links between Union cities allowed for the quick and cheap movement of troops and supplies. Transportation was much slower and more difficult in the South which was unable to augment its much smaller rail system, repair damage, or even perform routine maintenance. The failure of Davis to maintain positive and productive relationships with state governors (especially governor Joseph E. Brown of Georgia and governor Zebulon Baird Vance of North Carolina) damaged his ability to draw on regional resources. The Confederacy's "King Cotton" misperception of the world economy led to bad diplomacy, such as the refusal to ship cotton before the blockade started. The Emancipation Proclamation enabled African-Americans, both free blacks and escaped slaves, to join the Union Army. About 190,000 volunteered, further enhancing the numerical advantage the Union armies enjoyed over the Confederates, who did not dare emulate the equivalent manpower source for fear of fundamentally undermining the legitimacy of slavery. Emancipated slaves mostly handled garrison duties, and fought numerous battles in 1864-65. European immigrants joined the Union Army in large numbers, including 177,000 born in Germany and 144,000 born in Ireland.