Many Indian people fought and died (as British Soldiers) in both World Wars, however they saw next to no benefit for their sacrifice and as such were compelled to revolt against the ruling British.
The Roman Empire is the empire it began in
1) values
2) Greeks Egyptians and Romans
3) religious
4) magic crops
5) speech fire oil and honey
6) horses
7) behaviour
8) hubris
9) Paul Bunyan and John Henry
They often aligned themselves with other developing nations to create a bloc. They have the power of one super power nation, but they are still able to speak their countries opinions. Either wise, they would be completed over powered.