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How long would they have lasted? Is it possible that the Roman Empire would conquer more areas, or more importantly, would they last into modern times? The Catholic Church had power even until modern times, so it's not that far fetched to assume the Roman Empire would exist as a political group in the modern era. I assume that similar to how the Ottoman Empires disolved in the modern era, if the Roman Empire never fell in the 5th century (which i believe happened because of germanic tribes), it would eventually dissolve somewhere between the 18th and 20th centuries.
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