stylistic:tone, quality:correction
Historical significance

The French victory marked the end of a long period of instability that had been seeded with the Norman Conquest (1066), when William the Conqueror added "King of England" to his titles, becoming both the vassal to (as Duke of Normandy) and the equal of (as king of England) the king of France.

When the war ended, England was bereft of its Continental possessions, leaving it with only Calais on the continent (until 1558). The war destroyed the English dream of a joint monarchy and led to the rejection in England of all things French, although the French language in England, which had served as the language of the ruling classes and commerce there from the time of the Norman conquest, left many vestiges in English vocabulary. English became the official language in 1362 and French was no longer used for teaching from 1385.

National feeling that emerged from the war unified both France and England further. Despite the devastation on its soil, the Hundred Years' War accelerated the process of transforming France from a feudal monarchy to a centralised state. In England the political and financial troubles which emerged from the defeat were a major cause of the War of the Roses (1455–1487).

Historian Ben Lowe argued in 1997 that opposition to the war helped to shape England's early modern political culture. Although anti-war and pro-peace spokesmen generally failed to influence outcomes at the time, they had a long-term impact. England showed decreasing enthusiasm for conflict deemed not in the national interest, yielding only losses in return for high economic burdens. In comparing this English cost-benefit analysis with French attitudes, given that both countries suffered from weak leaders and undisciplined soldiers, Lowe noted that the French understood that warfare was necessary to expel the foreigners occupying their homeland. Furthermore, French kings found alternative ways to finance the war – sales taxes, debasing the coinage – and were less dependent than the English on tax levies passed by national legislatures. English anti-war critics thus had more to work with than the French.

A 2021 theory about the early formation of state capacity is that interstate war was responsible for initiating a strong move toward states implementing tax systems with higher state capabilities. For example, see France in the Hundred Years' War, when the English occupation threatened the independent French Kingdom. The king and his ruling elite demanded consistent and permanent taxation, which would allow a permanent standing army to be financed. The French nobility, which had always opposed such an extension of state capacity, agreed in this exceptional situation. Hence, the inter-state war with England increased French state capability.

Bubonic plague and warfare reduced population numbers throughout Europe during this period. France lost half its population during the Hundred Years' War, with Normandy reduced by three-quarters and Paris by two-thirds. During the same period, England's population fell by 20 to 33 per cent.