Based on the model given, the reason why some revolutions end in the restoration of the old order is that the underlying problems that led to the revolution weren't adequately addressed.
Why do some revolutions fail?
Revolutions often fail because the leaders that were put in place by the revolutionaries, fail to solve the problems that caused the revolution in the first place.
This leads to the new government becoming weak and then being overthrown after drastic actions are taken to maintain the power of the new government.
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