Question

after 450 years as a republic, rome became an empire in the wake of julius caesars rise and fall in the first century b.c. the long and triumphant reign of its first emperor, augustus, began a golden age of peace and prosperity. diocletian divided power into the so - called tetrarchy (rule of four), sharing his title of augustus (emperor) with maximian. at the council of nicaea in 325, constantine made christianity romes official religion. the eastern roman empire - later known as the byzantine empire - would remain largely intact for centuries to come. an entirely different story played out in the west, where the empire was wracked by internal conflict as well as threats from abroad - particularly from the germanic tribes now established within the empires frontiers like the vandals... and was steadily losing money due to constant warfare. - history.com

Explanation:

The text discusses the history of the Roman Empire, including its transition from a republic to an empire, key emperors, religious changes, and the fate of its eastern and western parts. This falls under the History subfield of Social Science as it deals with historical events, political and social developments over time.

Answer:

Social Science - History