Neither Rome nor Britain fell because of frivolous wars.That is not what history tell us from Pax Romano to Pax Britannica once a country wasted their treasury on frivolous war it always end up with the dissolution of decline of that country!
Rome still exist 200 years after sacking by the German tribe. But eventually it is gone!
British empire fell because primarily because britain and the parts of the empire it was willing to develop was small, and it was not able to, or not far sighted enough to attempt to, make the sacrifices required to fully leverage the potential of its rest of its empire to counter much larger and more potent foes.
Rome got past britain’s problem in a way britain never did, but was not able to maintain sufficient internal political stability to resist the pressure of continent wide popukation movement across the interior steppes of Euroasia.
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