The major cause of the Hundred Years' War was the longstanding territorial and dynastic disputes between the Kingdoms of England and France. It began in 1337 and lasted until 1453, with intermittent periods of conflict and peace. The main point of contention was the claim of English kings to the French throne, which led to ongoing conflicts over control of territories in France. Additionally, economic factors, feudal disputes, and power struggles among the nobility also played a role in fueling the war.