"The Constitutional Convention was packed with experienced lawmakers – 40 of its 55 attendees had served in the Continental Congress."
That is why I'm comfortable treating Revolutionary America's constitutional delegates as operating-system designers - they were state-appointed delegates, and 40 of the 55 attendees had already served in the Continental Congress. + Original publication year of Sol Bloom's The Story of the Constitution; the National Archives page notes a 1986 reprint and c1937 original.
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