There are many factors that allowed the Roman Empire to last as long as it did, and you'll get a different answer or two or three from anyone you ask. I think it was able to endure so long because of its ability to absorb other cultures and Romanize them. This Romanization gave the various peoples in the empire a sense of unity and belonging instead of being subservient to a superpower.
No women were allowed to "vote" in the Roman Empire
How did changing ideas about what made up the Roman community help the Roman Empire survive
Trade
Trade
Trade
wealthier half included most of the great cities and trading centers; smaller area was easier to defend
the recurve bow
Because the western empire was plagued by invasions and existed only in name by the 5th century. The eastern empire by contrast survived until 1447
The Roman Empire was a mosaic of many religions. The Romans had their own religion: Roman religion. the conquered peoples had their own religions and were allowed to continue to worship them.
One aspect of the "old Roman Empire" that was carried on to the new eastern Roman empire, which became the Byzantine Empire was the standard of written laws. This was an important feature of the old Roman republic and later when the republic was a shell of its former self. Generally referred to as the Roman Empire, there were still written laws.The governing office of Emperor also was carried on.
No. It was the only empire to adopt the Orthodox version of Christianity, but the Roman Empire did practice Roman Catholicism at a time. Many other later European Empires also allowed Christianity, heading the crusades and converting parts of present-day Russia. Some examples of such empires would be the British Empire, the German Empire, the Spanish Empire, and the French Empire.
It brought the Roman civil War to an end and allowed the beginning of stability within the Roman Empire.