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.
1 In a presidential system, the central principle is that the legislative and executive branches of government are separate. 2  This leads to the separate election of president, who is elected to office for a fixed term, and only removable for gross misdemeanor by impeachment and dismissal. number of key theoretical differences exist between a presidential and a parliamentary system: 1  In a presidential system, the central principle is that the legislative and executive branches of government are separate.