History is the interpretation of the significance that the past has for us. - Johan Huizinga
By the 14th century it would have been obvious to all but the dullest historians that neither the German nor the Greek pretenders to the title of “Roman Empire” were remotely the same as the original entity which had borne that name, and unconnected to it by anything other than a long and winding chain of historical events. But it would not have been so obvious to an historian of the 10th century, and one of the 6th would probably have violently disputed the claim (at least in the case of the Eastern Empire). Modern scholars looking at the events from over a millennium later decided that after 476, things began to change so dramatically and so quickly that a different name needed to be applied to the political entities existing after that date so as to make the difference clearer for purposes of study and discussion. But the people living at that time had no such historical perspective; few of them would have agreed that the differences between Odoacer’s reign and that of Julius Nepos were any more meaningful than those between the reigns of Constantine and Constantius, and probably less significant than the difference between the reigns of Diocletian and Aurelian. They were emotionally invested in the name “Roman”, and the changes in both the Empire and its people had been so gradual that only by viewing the events from a period completely removed from them could a meaningful line be drawn between “Roman” and “Post-Roman”.
Rome is an especially prominent and striking example, but by no means the only one; except in cases where a culture is completely overrun by wholly alien invaders (as in the case of the European conquest of the Americas), most lines drawn between historical periods and most names given them by historians are rather arbitrary and only make sense to people of later eras. Those living at the time see no seismic shift, no change of identity; the English still considered themselves English after the Norman Conquest, and the lives of peasants were largely the same in 1067 as they had been in 1065…but historians regard the unified England of the late 11th century as a different thing from the Anglo-Saxon realm of a generation before, and not only because the rulers were speaking a different language.
But less than a hundred years later, that began to change; the United States now bears more resemblance to the bloated, top-heavy, militaristic, moribund Roman state inherited by Odoacer than the lean, minimal government conceived of by the Founders. Yet for now, the people of the US are still so emotionally invested in the label “American” and so blindly devoted to worship-words like “freedom” that they are unable to recognize that we’ve already crossed the line future historians will draw between the American Republic and the American Empire. When did we pass from one to the other? Alas, I’m in the same forest as you are; only the perspective of time will allow us to determine that. Perhaps they’ll draw it at the end of the Cold War; perhaps even earlier, at the end of World War II. Maybe they’ll make it simple for student memorization by setting it at the beginning of the 21st century. But one way or another, it is insulting to the Founders’ memory to associate any patriotic feelings you have for the memory of the nation they created with the repressive fascist police state that now occupies its territory; the 4th of July is now a memorial rather than a celebration, and the Spirit of ‘76 is nothing but a ghost.