The Hundred Years' War, fought between England and France from 1337 to 1453, is significant for several reasons. It marked a transformative period in medieval history, influencing national identity and the nature of warfare in Europe. The conflict saw the rise of strong centralized monarchies and the decline of feudalism, as England and France began to shift towards more modern state structures. Additionally, the war introduced new military technologies and tactics, including the use of longbows and cannons. It also fostered a sense of nationalism among the French and English peoples, shaping future nations' identities.