The Economist has a fascinating visual piece correlating India's states and union territories to equivalent countries of the world in terms of economy and population.
If Uttar Pradesh were to declare independence, it would be the world’s fifth most populous country (as the map below shows, it has about the same number of residents as Brazil). Yet its economy would only be the size of Qatar, a tiny oil-rich state of fewer than 2m people. That makes it poor on a per person basis. Despite India’s two decades of rapid growth, Uttar Pradesh’s GDP per head is close to that of Kenya.