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.
Presidential Gov't Parliamentary Gov't Both are democratic type governments. Both are able to overrule and get rid of their leaders. Both leaders roles (president and prime minister) are sorted in the executive branch. The president serves as both the chief of executive and the head of state. The head of state and chief executive are two different people. The chief executive is chosen by the legislature, while the head of state serves for a more ceremonial purpose. The president is chosen by the people, not the legislature. Party members almost ALWAYS vote for their party leader.