<P> Several significant English victories in the war--especially at Crécy, Poitiers, and Agincourt--raised the prospects of an ultimate English triumph, and convinced the English to continue pouring money and manpower into the war over many decades . However, the greater resources of the French monarchy precluded a complete conquest . Starting in 1429, decisive French victories at Orléans, Patay, Formigny, and Castillon concluded the war in favour of France, with England permanently losing most of its possessions on the continent . By then, the English investment in the war had been so great, and its loss so shocking, that the resulting discontent erupted into the Wars of the Roses (1455--1487), a series of civil wars that ultimately ended the Plantagenet dynasty . </P> <P> It was one of the most notable conflicts of the Middle Ages, in which five generations of kings from two rival dynasties fought for the throne of the largest kingdom in Western Europe . By its end, feudal armies had been largely replaced by professional troops, and aristocratic dominance had yielded to a democratisation of the manpower and weapons of armies . Although primarily a dynastic conflict, the war gave impetus to ideas of French and English nationalism . The wider introduction of weapons and tactics supplanted the feudal armies where heavy cavalry had dominated, and artillery became important . The war precipitated the creation of the first standing armies in Western Europe since the time of the Western Roman Empire and thus helping to change their role in warfare . With respect to the belligerents, in France, civil wars, deadly epidemics, famines, and bandit free - companies of mercenaries reduced the population drastically . </P> <P> The root causes of the conflict can be found in the demographic, economic and political crises of 14th century Europe . The outbreak of war was motivated by a gradual rise in tension between the kings of France and England about Gascony, Flanders and Scotland . The dynastic question, which arose due to an interruption of the direct male line of the Capetians, was the official pretext . </P> <P> The question of female succession to the French throne was raised after the death of Louis X in 1316 . Louis X left only a daughter, and his posthumous son John I lived only a few days . Furthermore, the paternity of his daughter was in question, as her mother, Margaret of Burgundy, had been exposed as an adulterer in the Tour de Nesle affair . Philip, Count of Poitiers, brother of Louis X, positioned himself to take the crown, advancing the stance that women should be ineligible to succeed to the French throne . Through his political sagacity he won over his adversaries and succeeded to the French throne as Philip V. By the same law that he procured, his daughters were denied the succession, which passed to his younger brother, Charles IV, in 1322 . </P>

What caused the hundred years' war between france and britain
find me the text answering this question