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.
There are similarities and differences between a parliamentary democracy and a presidential democracy. One similarity is that in both forms of government, the people elect their representatives. This gives the people significant power since they are able to decide who will represent them. There are differences between the two forms of democracy. The United States has a presidential democracy, while the United Kingdom has a parliamentary democracy. In a presidential democracy, separation of powers is important. There are specific jobs that each branch of government has.