Although there are numerous factors that can affect a counties GDP, especially today when the entire world is so "connected", a major reason why GDP fluctuates so much in this part of the world is that these economies rely primary on agriculture, which can be profitable one year and then not profitable the next, due to weather changes.
By far the most lasting impact of the Constitution is that is has spread the idea of democratic government throughout the world and make it harder for dictatorships to strive.
