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You challenge is to have India fall into a brutal civil war, instead of the brutal ethnic movements that we had in OTL. The POD could be at any point from 1900 onwards.

The challenging part is that this must not be a simple war between India and "Pakistan", but a multi-sided conflict with several regions fighting to regain their independence lost during the colonization of India by the BEIC. So long dead nations such as Mysore, Bengal, Rajputana and Haidarabad make a glorious return.

Bonus points if India fails to suppress them and falls apart, balkanizing in the process.
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