The creators of the first "government" had nothing to base their model on. You have at least an average (although because you are posting in a political thread I'd say above average) knowledge of government. Also, like any good system, a good political/governmental system functions logically, a form of thought everybody is capable of.
Really, they didn't loosely base it on the ancient Greek construct of a/the Republic, or something like that????
*neither a history nor a poli. sci. buff*
'Cause you can't handle me...
"A lie is a lie even if everyone believes it. The truth is the truth even if nobody believes it." - David Stevens
"That that is, is. That that is not, is not. Is that it? It is."