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In the later centuries, Rome recruited soldiers often from the populations that were conquered years and sometimes centuries earlier. This created a situation where some would break away or rebel and use the very same Roman battle tactics against Romans. Mercenaries like Titan, Blackwater, CACI, etc. can have loyalties bought off. Machiavelli's opinion of mercenaries was rather low for a reason.
The US has something like 730 military outposts in the world today. That's a vast amount of territory to keep watch over, and the US government is currently spending itself deeper into debt to maintain its worldwide presence. Eventually, either the citizens will be forced to pay more in blood and treasure, or the "colonial possessions" will have to be surrendered like Rome surrendering Britain so that the legions could be used elsewhere to help keep a beleaguered Empire from collapsing inward like a black hole.
Rome chose to try to keep its empire rather than pull back. Now it is nothing more than a memory.
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