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 presidential system, the legislature and the executive do not have to be aligned and often work against each other. 2  Policy implementation can be much slower and more moderated, at least in the US system.
In a parliamentary system, the legislature is the part of government that makes laws. The legislature also gives power to the executive (the part of government that enforces laws). This is the basic form of a parliamentary republic.The difference is how the legislature gets its power.The legislature is not chosen by a ruler or by birth. The people choose the legislature in an election.he legislature also gives power to the executive (the part of government that enforces laws). This is the basic form of a parliamentary republic. The difference is how the legislature gets its power. The legislature is not chosen by a ruler or by birth.