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Answer:
Lack of unity.
Explanation:
The rebellions between 1068 and 1071 against King William failed because they lack the unity. This lack of unity was the main factor that is responsible for the failure of rebellions in their mission. if these rebellions were united they were able to overthrow the throne of the king William so not William’s leadership and Castles, the main factor that contributed in their failure was their disunity.