Engineering Good Government

Looking back over the history of the United States, it is not just remarkable to see how 13 former colonies of the British Empire could come together to form what became the longest continuously functioning government in recorded history, but it is also incredible that such a durable government was set up as a republic. Until the United States, history records few examples of even moderately successful republics, and even those moderate successes were aided by factors external to the specific system of government employed. How, then, did the framers of the U.S. Constitution succeed in creating a republican-style government where so many had failed?