How did the hundred years' war contribute to the end of europe's medieval period?

The Hundred Year's War (HYW), which was actually a series of related conflicts that lasted for well over a hundred years, was a very event that effected almost the whole of western Europe during the late Middle Ages (from the 1330s onward). It was a struggle for supremacy between the two preeminent powers in western Europe (England and France) but also involved many lesser powers (Scotland, the Duchy of Brittany, Castille, etc.).

Not sure this is a hard one huh