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.
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growing levels of government spending
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Knights were professional warriors who helped nobles protect their land.
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The 1st one is the Volga River, 2nd Lake Baikal, 3rd Balitic sea and 4th Black sea