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How can the Indian subcontinent (OTL Pakistan, India, Bangladesh, Burma, and Sri Lanka) be divided so that no country has more than 2.5% of the world's population?
(To put that in perspective -- OTL, Pakistan has 2.49% with under 172 million, while India has 17.3%, approaching two billion -- source.)
Preferably, no PoDs before 1900. It is permissible for the purposes of the OP, to slow the population growth in areas of the subcontinent (or as a whole) as long as you show your work.