No other government that was in existance when the Constitution was ratified still exists without radical alteration.

The English added a Prime Minister and the House of Commons. Germany is a country, not a lot of squabbling fifedoms. Dito Italy. Spain is no longer a monarchy. The Tzars, Emperors and Shogun would no longer recognise Russia, China or Japan.

All things of human creation wear out, or more often, spoil. I can't say for sure if we are the visionaries who wish to search the future, or the reactionary dinosaurs who pine for the past. Nor do I care.

I'm not sure what I'm trying to say, so I'm going to shut up now. I'll reply to myself if I figure it out.