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.
One main criticism and benefits of many parliamentary systems is that the head of government is in almost all cases not directly elected. In a presidential system, the president is usually chosen directly by the electorate, or by a set of electors directly chosen by the people, separate from the legislature.However, in a parliamentary system the prime minister is elected by the legislature, often under the strong influence of the party leadership.ne of the commonly attributed advantages to parliamentary systems is that itâs faster and easier to pass legislation. This is because the executive branch is dependent upon the direct or indirect support of the legislative branch and often includes members of the legislature.