What factors led to the Civil War's conclusion?

The American Civil War ended due to many factors. The Southern armies had been worn away due to four years of attrition. Northern armies were continuing to grow and, under the leadership of Grant, were becoming more organized. The Union commands in the Eastern and Western theaters were starting to work together so that the South had to defend all of its territory at once. The South could not even feed its armies in the field, and this was starting to play havoc on the morale and health of the men.
The Southern people were also growing tired of the war. Sherman's March to the Sea had taken the war to the lower South. The Southern people were starting to feel the hardships brought about by four years of a Union blockade that was becoming more effective as the South lost its blockade runners.
Finally, the South never received the European support for its independence that it coveted. Britain and France looked for new sources of cotton rather than risk fighting with a desperate United States in order to lift the blockade. Lincoln's Emancipation Proclamation not only weakened slave states by giving slaves an incentive to leave the South, but it also made supporting the Union a just cause in that it was the side against slavery. Without military and financial assistance from overseas, the South could not endure a war of attrition.