If we take the widest view of the definition of feudalism, then we could say it was pretty much general for Western Europe for most of the Middle Ages after the seventh century or so.
If we take the narrow view, that feudalism was a hierarchical system designed to provide quick action in large countries where a weak central government could not respond quickly, then feudalism existed in France and the Holy Roman Empire after the division of the Carolingian Empire, and in England briefly after the Norman Conquest.
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Charlemagne did not bring feudalism to Europe. He did bring a series of changes that improved feudal society at this time.
it was based on feudalism... there is a feudalism pyramid if you go on google images and type in feudalism pyramid
The crusade affected Europe in two ways. They increased trad between Europe and the Middle East, and the helped break down feudalism.
After the Roman Empire Collapsed
Feudalism was already in decline by the time of the Crusades due to factors such as the growth of centralized monarchies and the rise of commerce. The Crusades did contribute to the decline of feudalism by weakening the power of feudal lords and increasing the authority of monarchs. However, it is unlikely that feudalism would have continued indefinitely even without the Crusades due to the broader socio-economic changes taking place in Europe during that time.