Instead of poor we can populated states. UP , Bihar , WB is most dense populated. Govt never takes measures to control population increase. Still UP population growth rate is at 20% and Bihar at 25% last decade where kerala population growth rate at 5% and TN, Karnataka at 15%.
UP at 20 crs at growth rate of 20% where as TN 7 crs at 15% growth matters a lot in numbers.