WORLD HISTORY

Detailed explanation-1: -Rome was able to gain its empire in large part by extending some form of citizenship to many of the people it conquered. Military expansion drove economic development, bringing enslaved people and loot back to Rome, which in turn transformed the city of Rome and Roman culture.

Detailed explanation-2: -The empire controlled 2 million square miles of territory. This many people and this much land required sophisticated administration and technology. Hundreds of miles of Roman roads connected the empire, linking its cities, allowing its armies to march, and facilitating trade.

Detailed explanation-3: -During his 19-year reign, Trajan expanded the Roman Empire to its farthest territorial limits up until that date. The empire stretched from Scotland down to North Africa and swept east across the Mediterranean as far as Mesopotamia, or modern-day Iraq.