This is a confusing question. First please remember that Rome was already an empire under the republic. What is erroneously called the "Roman Empire" is the Principate. The government of the republic was by popular election while the government of the principate was by appointment. Both forms of government used the senate as a consulting body.
In short - the Roman Empire The main reason is due to the military reforms of Gaius Marius, which made the Roman legions a professional standing army. The legionary became a dedicated heavy infantryman and legions as a whole were much more standardized and better equipped Although service in the imperial legions was usually voluntary, the incentives to join the military were much greater than in the age of the Republic (which was almost always conscription based) which allowed for the steady pool of Roman manpower in addition to evermore present use of auxiliaries Having permanent professional armies also made for greater numbers of seasoned veterans. From a numerical standpoint - During the Republic, only a few legions (5 or so) were on hand at any given time for national defense. More legions were only levied in times war. The most legions Rome ever had was during the height of the Civil War, which was about 29 legions. After the Marian reforms the number was dropped to either 24 or 25 at any given time during the height of the Roman Empire. Imperial legions also had about 1000 more soldiers than Republican legions when fully reinforced (not including auxiliaries The Republic did, however, posses the largest Roman Navy but I wouldn't weigh it too much in this answer simply because the navy never made much of a significant military impact after the Punic Wars besides ferrying troops now and then.
They are two different things. A republic is a form of government while an empire is a political structure. In a republic officials are elected by the voters to rule for them. An empire is a large holding ruled by one central authority. In the case of Rome, it was an empire under the republic and also under the principate as all its provinces were ruled from Rome under Roman law. In other words, Rome was an empire under two forms of government, the republic and the principate.
Your question is impossible to answer because you are trying to compare two different things. A republic is a form of government; an empire is a holding of some type. The two are different. Besides, Rome was an empire while it was being governed as a republic. It continued as an empire after the republic fell and it was governed as a principate.
The Roman empire lasted longer than the Roman Republic.
The Roman empire lasted longer than the Roman republic.
The Roman empire lasted longer than the Roman republic.
The Roman empire lasted longer than the Roman republic.
The Roman empire lasted longer than the Roman republic.
The Roman empire lasted longer than the Roman republic.
The Roman empire lasted longer than the Roman republic.
The Roman empire lasted longer than the Roman republic.
The Roman empire lasted longer than the Roman republic.
Athenian democracy, Roman Republic, Roman Empire
The unicorn they ride is different, the Republic has magic white ones.
The Western half of the roman empire is a bla bla civilization The Eastern half of the roman empire is a bla ba dee bla civilization
The Senate!
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There really is no major difference. The Roman Empire was the empire itself, lasting from 27 BCE-476 AD (1453 for the Eastern half, which came to be the Byzantine Empire). In the beginning the Roman empire was an autocracy, headed by emperors. It then later turned into a republic, which is when people use the term Roman Republic or Republic of Rome. This is actually where the modern day type of republic comes from, Rome.
Athenian democracy, Roman Republic, Roman Empire
The Republic was a type of democracy (before the empire) and not very successful. The Pax Roman was a time of peace for the Roman empire because of good trade.
The Ebro River.
the Empire was virtually a Dictatorship and the republic was a democracy
The unicorn they ride is different, the Republic has magic white ones.
Julius Caesar is the military leader and the dictator who transformed the roman republic into an roman empire. He assumed total power after transforming the republic into the empire.
The Roman Republic was ended by the takeover of the senate by Ceaser. He essentially became the supreme ruler, or emporer. So essentially, the Roman Republic was replaced by the Roman Empire.
The Holy Roman Empire had nothing to do with the Romans. It was a medieval institution centred around Germany. The Roman republic became an empire by expansion both before and after the Punic wars.
Yes!
The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.The Roman republic was a form of government and the Roman emperor was a man. If you mean the difference between the Roman republic and the Roman empire, there was no difference except in the form of government. Rome was already an empire under the republican form of government. When a single person took over leadership of that government, it became the principate or what is erroneously called the "empire". In both types of government, vast amounts of territory were ruled by a single authority, the senate under the republic and the "emperor" under the principate. Both the republic and the principate met the criteria for an empire.
Roman Republic 4xx to 28 BCE. Roman Empire 28 BCE to 476 CE, however the Byzantine Empire in the east continued until 1453 CE.