What are the different causes of the animals' rebellion in Animal Farm by George Orwell?

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 There is no one
thing that caused the rebellion, however the boar of Manor Farm, Old Major, told the
animals that it was time to rise against Jones and start their own society which would
be ruled by them and which would treat all animals equally.
However, the
actual rebellion didn't occur until after Old Major's death when Farmer Jones and his
men forgot to feed the animals for a long period of time. Fed up with being hungry and
neglected, the animals got Boxer to kick open the feed stores so they could eat.  When
they figured out they had within them the power to fend for themselves, they drove
Farmer Jones, his wife, his workers, and the Raven (church) off, and renamed the farm
Animal Farm.

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