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.
Parliamentary: Prime Minister not directly elected and he is not the Head of State. Presidentialist: President is Chief Executive, Head of State, AND Head of Government. Parliamentary: No Separation of Powers. Presidentialist: Seperation of Powers between the different branches of the government. Parliamentary: Prime Minister must have the confidence of the parliament. With a vote of no confidence he is removed. The Prime Minister can dissolve Parliament. Presidentialist: Impeachment is the only legal way to remove the President from office.