You mean a bloated empire that had become too greedy and reliant on colonization, leading to the literally millenia-old cycle of the methods of colonization coming home to roost upon the home populace, leading to ever greater wealth and power disparities, leading to an era of bread and circuses to distract the populace, leading to even the bread and circuses running out, until a quasi-democratic republic falls to fascism to withstand the troubles it made for itself, but even that is too little too late, and fhe empire crumbles upon itself?