‘systems it has been running concurrently with’. Aka during the same times.
What other gov’t during the same time period has lasted as long or longer (none that I am aware of), let alone has produced prosperity, etc. to the same extent?
And it isn’t actually gone yet, either.
> What other gov’t during the same time period has lasted as long or longer
Yes, very few last 250 years.
USA has had some close calls before, the Civil War was horrific.
Nothing lasts forever, but I would not bet against the USA's system perpetuating itself this time, too
> What other gov’t during the same time period has lasted as long or longer (none that I am aware of), let alone has produced prosperity, etc. to the same extent?
The constitutional system of the United Kingdom is over 1000 years old.