Final answer:
The Hundred Years' War illustrated the weakness of monarchy through the centralization of power in France, highlighting the need for strong leadership amidst a military conflict.
Step-by-step explanation:
The Hundred Years' War had a profound impact on the concept of monarchy as a system of government. In France, the war led to centralization of power, as the conflict underscored the need for a strong leadership capable of defending the kingdom and forging a collective national identity.
The French monarchy, therefore, was reinforced rather than weakened, with royalty taking direct control over lands and establishing a centralized nation-state. In contrast, England saw an increase in the power of Parliament as the monarchy had to call it more often to finance military campaigns, which eventually shaped the foundation of a representative government.
The war demonstrated the evolving relationship between the monarch and other political entities within the state, leading to a shift from feudal privileges to a more centralized royal authority in France, and a move towards a parliamentary system in England.