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.
Presidents take more direct personal charge of policy than the cabinet does in a parliamentary system. The majority party and the cabinet are a team in a parliamentary system. But the president is directly elected by the people. Unlike parliamentary cabinets, the presidential cabinet does not contain party notables.The president is also the head of the army and directly responsible for foreign policy.residential System of Government. A presidential system is a system of government where an executive branch is led by a president who serves as both head of state and head of government.