he improved new tax and bulit a professional army
Augustus changed the republic by adding another layer of political office, namely that of the "first citizen" to the magistrates. Although the consuls were still in office, they had little or no power as the main powers and authorities rested in the first citizen, a.k.a. emperor.
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The Roman Republic ended when Caesar Augustus came to power
The Roman empire was an empire before Augustus. It was an empire under the republican form of government. In other words Rome was governed as a republic before Augustus. During and after Augustus the empire was governed by the principate form of government.
Julius Caesar overthrew he senate and started the Roman Empire. Augustus Caesar, Julius' grand-nephew, was the first emperor.
The Roman Republic was established in 509 BC when the Roman Monarchy was overthrown, and was itself overthrown in 27 BC as a result of the Civil War that followed the assasination of Julius Caesar. It was replaced by the Imperial government of Augustus Ceaser and his successors.
AnswerJulius Caesar, after him Octavius Caesar AnswerThe Roman Republic was governed by the Senate, as elected representatives of the Roman citizens. The Roman Empire was ruled by the various Emperors, Julius Caesar being the first of them. The next of the Emperors was Octavius Caesar.