The Sumerians were the first people to migrate to Mesopotamia, they created a great civilization. Beginning around 5,500 years ago, the Sumerians built cities along the rivers in Lower Mesopotamia, specialized, cooperated, and made many advances in technology. The wheel, plow, and writing (a system which we call cuneiform) are examples of their achievements.
1 In a Parliamentary System, the head of state is usually a different person than the head of government (not in every country). 2  The HOG is often vested with more official power, but holds that position for a relatively short time.
However, parliamentary systems have nothing to do with any of this. India, Switzerland, Germany, and Canada are are federations that have parliamentary governments. One has nothing to do with the other. A parliamentary government contrasts with a presidential or semi-presidential government, or with a dictatorship. These are different ways of dividing government power at the national level, not different ways of dividing power between national and regional governments.