What keeps the animals in Animal Farm from achieving the sort of equality that had been the original desire

What keeps the animals in Animal Farm from achieving the sort of equality that had been the original desire
What keeps the animals in Animal Farm from achieving the sort of equality that had been the original desire at the heart of their revolution against Mr. Jones
What keeps the animals in Animal Farm from achieving the sort of equality that had been the original desire at the heart of their revolution against Mr. Jones