The western empire was swamped by an influx of Goths and others moving westwards. No form of government could have stopped this.
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It was able to repel the Euroasian peoples who flooded in and took over the Western Empire.
The Eastern Roman Empire survived longer than the Western Roman Empire due to factors such as better economic stability, stronger military defenses, and a more centralized government. The Eastern Empire also had access to wealthier provinces and strategic locations that helped it withstand external threats.
The western part of the Roman Empire fell under the strain of the invasions of by the Germanic people. The eastern part of the Roman Empire was not affected by these invasion and therefore continued to exist. Note that Byzantine Empire is a term which has been coined by historians to indicate the eastern part of the Roman Empire after the fall of the western part. The people in question did not know this term and called their empire Roman Empire.
The Western Roman Empire.
the roman catholic church