After the 100 Years' War, the war expenses were very high. This caused the taxes to be raised. Unhappy with the drastic change in taxes, the citizens in France and England revolted.
Before the 100 Years' War, Europe was already in a time of economic crisis. Conditions were horrible and supplies were very low all throughout Europe. The Battle of Cadsand, the first battle of the 100 Years' War, was started because King Edward III was in debt. He ordered Sir Walter Manny to raid Cadsand, causing a battle that ended with and English victory. If King Edward III had not been it debt, the 100 Years' War may not have even happened. Also, in 1347, the Black Plague hit Europe which caused economic turmoil. The economy crashed, making it much harder for the war to progress.
Then, landowners started to bribe serfs to farm their land, which began capitalism, a system where a country's trade and industry is controlled by private owners for profit. Lords could not manage all of their land, so they gave land to commoners who could use the land for a profit. This began the middle class. The English army started relying on commoners who volunteer for military service over being serfs, so the army became more expensive to hold together. The war became mercenary, and soldiers just wanted to fight for whoever paid them the highest.
The English taxed the part of France that they controlled and raided the weak areas. They kept their enemy weak and forced them to replenish their resources again and again before they came back and stole it.
