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As far as the Roman Empire, the eastern half of the empire lasted until about the 15th century as the Byzantine Empire. Rome had been a Republic for 450 years or so before becoming an empire. This is a total span of almost 2000 years. So I don't think the observation that "all empires eventually come to an end" is very enlightening other than to point out just that. This is without even getting into the debate as to what an empire is and whether the US is one.
Here's my stab at it:
50-100 more years as #1 world power.
300 more years as a Republic
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