7.1.1 Study the early strengths and lasting contributions of Rome (e.g., significance of Roman citizenship; rights under Roman law; Roman art, architecture, engineering, and philosophy; preservation and transmission of Christianity) and its ultimate internal weaknesses (e.g., rise of autonomous military powers within the empire, undermining of citizenship by the growth of corruption and slavery, lack of education, and distribu tion of news).
Please read the following article titled, "Roman Empire" By Joshua J. Mark.
Study the map of the Roman Empire in 125 CE at the time of Roman Emperor Hadrian.
Source: Ancient History Encyclopedia