How Did Rome Become An Empire?

The government that Rome had was an Empire, that means the emperor decides what to do to the people, the law, or anything that makes him pleased but won't cause a crisis. When Rome became an empire, it meant that Rome had dynasties or states under a single ruler, usually an emperor or empress. After the fall of the Roman Republic, their emerged Rome's absolute ruler named Augustus, or Octavian. At that time, the Romans wanted to recover their great republic, and Octavian had told them he would restore the power of the Senates and the Roman people, but at that time, Octavian already was the emperor in complete control. Roman emperors had a role in Rome's daily life as well. For example, whatever the Emperor wants will be law.
Also, under the Roman Empire, Roman laws were unequal to the citizens. For example, the law made it so the poor had worse punishments for crime than the wealthy. So even in the cities where the wealthy stroll and the poor lived in narrow crammed places, Roman emperors still had power over all. Over the many emperors that Rome had, there were five emperors who shone the most. These emperors were, the most effective leaders, they were, Nerva who created the Nervan-Antonin Dynasty, Trajan, the second emperor of the Nervan-Antonin Dynasty, Hadrian, the third emperor of the Nervan-Antonin Dynasty, Antoninus Pius, the fourth emperor of the Nervan-Antonin Dynasty, and Marcus Aurelius, the fith emperor of the Nervan-Antonin Dynasty. Under their rule, the Roman Empire grew more powerful, became more stable, and expanded in size. The last two emperors, Lucius Versus and Commodus were shameful, being ineffective and rather pathetic. After their death rose the Severan Dynasty, their ruler being Pertinax who most likely participated in the assassination of Lucius Versus. During the Severan Dynasty's rule it defeated the Parthians, one of Rome's neighboring enemies, and expanded the