What is one common cause of the development of feudalism in both Europe and Japan

Wow, very nice, i will write you a whole essay if u dont be careful

feudalism developed for the want of an order, of rank especially, in society. Someone would proclaim himself the sovereign, but others, wanting to become like him, and make otehrs feel inferior, would give themselves the status of being higher than the rest.

the king would go along with this, since, as the tradition started becoming permanent, people grappled for his attention and good will with gifts, etc.

all of this started in europe, primaraly in england, around the 9th or 10th century.

europe: in 1512, the people revolted and made their king sign the magna carta, establishing their position, and an ever lasting rivalry, since they now had a say in the government, and could outrank, ergo the feuds (fights) for rank

the king wanted to control everything, even rural ppl, and tehy came to court, wanting a promotion

in japan: the emperor ruled

no revolts

a bit more orderly, and peaceful on the outside. I cannot give too much information, since i did china, but i know that they were similar, in wich case it really depended on the family, and birth, where as the emperor did not have much say (not bothering to) in the rural areas