The main advantage that the South had at the beginning of the war was its large army and well-trained generals. The Confederacy, from this perspective, appeared more capable of winning the war at the beginning of the conflict. Moreover, as most of the fighting was carried out in the South, they also had the advantage of knowing the territory.
I do not think that the South failed to exploit its initial advantages. The Confederacy fought extremely well during the early stages of the war. However, the North's advantages were finally just greater. The South relied on agriculture, which was rendered unviable during the war. Moreover, it had a much smaller population, and its workforce was destroyed after emancipation. All of these put the Confederacy in a particularly difficult position.
The Third Estate in France was made up of the commoners. This group comprimised 98 per cent of the population. Most were rural peasants working on farms as share croppers to a lord. There were also urban commoners who lived in the cities whose life was little better. The third estate was not represented by the government. High taxes and other required payments, lack of housing and high rents plus rising food prices all contributed to the French Revolution.