Due to a nuclear winter the world won't exist anymore (normal).
Serious answer? The European Caliphate.
Your answers are clearly insane, but you have a good point in that it is very far into the future, so we really can have no clue what so ever.
For a starter, 85 years ago there was no EU or (independent) India, so it might be some state/union that is not yet formed. Technological development in general might also change things drastically. Then it depends on what you look at. Right now USA has, by far, the largest military. However, EU has the biggest economy.
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