Question

What are the common features of the three regional states of Bengal, Awadh and Hyderabad?

Answer 1

These three states were the major provinces during the british rule .
Bengal ,awadh and hyderabad all three were major source of revenues and gave most of the contribution to revenue.
Apart from that all these three provinces were independent and powerful and but maintained their diplomatic relationship with the mughal emperor.
These three regions framed the most of the part of indian political system and most policies were mainly focussed to these three provinces.

Answer 2

These three were important princely or imperial provinces during the British Raj. All three had Nawabs or Muslim rulers in power. Culturally, all three were far advanced compared to most of the rest of undivided India.