Why did the Western Roman Empire fall shortly after the partition of 395, and the Eastern one lasted another thousand years?
The Roman Empire was destroyed by slavery, endless coups and the invasion of barbarians. Unlike the Roman Empire, Byzantine survived and flourished even more, since it abandoned slavery, replacing it with a feudal system, Constantinople became the capital of Byzantium, which was built by the Emperor Constantine, making it the capital of the Roman Empire, after the split of the empire, Constantinople became the capital of Byzantium, and the capital of Western Rome became again.
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