They wrote the document defining the currently longest running continuous government in the world.
Is the Constitution perfect? No.
But it's still fair to call them geniuses for what they accomplished.
Also, you are arguing the Founders interpretation of the Constitution is the same as the current Supreme Court. I'm not sure they would agree, but there's no way we can ever know.
Surely, the UK government predates the US, dating back to at least Cromwell, so 17th century, and tenuously as far as Magna Carta (and even Alfred tbe Great if you like, so deep deep medieval).
The Taiping rebellion started before the American civil war and lead to far more deaths. On wikipedia the estimate is 20-30 million. Outside of that, just going to the wikipedia page for deadly wars will find many that dwarf the American civil war.
I think you mean that the US has the longest continuous running democracy - not just government [1] I think this true and I agree with you that the while the constitution is not perfect, it is still an incredibly impressive document.
I find that list very questionable. I'm Swedish and while yes, we sorta got general voting rights for men in 1911, we didn't get truly general voting rights for men until 1918 and women 1919.
However, before that you could vote if you had enough captial. Is that democracy? That list says it isn't whilst saying that America, in which minorities and women could not vote, is a democracy. That seems like a line draw specifically to be able to say America is the oldest democracy, very disingenuous.
If you consider minorities and women to be people then America didn't become a true democracy until 1965.
Is the Constitution perfect? No.
But it's still fair to call them geniuses for what they accomplished.
Also, you are arguing the Founders interpretation of the Constitution is the same as the current Supreme Court. I'm not sure they would agree, but there's no way we can ever know.