States are not being left behind. These is development in each and every state. Only difference is some states got a head start on others. India is better than it was 10 years ago, and will be even more better 10 years from now.
I hope India does well, its trying its best to be a good secular democracy. While there still needs to be a lot of work done & its far from perfect, they're moving in the right direction I guess, & the effort on their part is commendable. Pakistan is trying its best as well, has fared admirably during tough times, & it will be a good day when Pakistan & India can solve all their outstanding issues amicably.