Indian Politics
The President's Rule is imposed on a State in India, when-

The elections are announced
There is a Constitutional breakdown
The Governor of the State dies
The State Cabinet' of Ministers resigns

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Indian Politics
The parliament can legislate on a subject in the state list

if the legislatures of two or more states recommend to the Parliament to legislate on such a subject
for the implementation of treaties and agreements with foreign powers
if the Rajya Sabha passes a resolution by two-third majority declaring the subject in state list of
All listed here

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