Which country will be the superpower in the future? 1. United States of America 2. China 3. Others?

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I think the answer depends upon how you define superpower. The internet suggests:

- "a very powerful and influential nation"

Based on this definition but stretched to include the EU, I think that currently we have: 

1. EU
2. USA
3. China

In the long term I would expect to see India join that group. This is just based on population size. It could take another 50-100 years but eventually I think it will happen.

EU could slip away from the list if it breaks up. This is the main driver of Russia / USA-rightwing in pushing for Brexit and EU break-up.