Title: Separation of powers under the United States Constitution
Content:   Separation of powers is a political doctrine originating in the writings of Charles de Secondat, Baron de Montesquieu in The Spirit of the Laws, in which he argued for a constitutional government with three separate branches, each of which would have defined abilities to check the powers of the others. This philosophy heavily influenced the writing of the United States Constitution, according to which the Legislative, Executive, and Judicial branches of the United States government are kept distinct in order to prevent abuse of power. This United States form of separation of powers is associated with a system of checks and balances. During the Age of Enlightenment, philosophers such as Montesquieu advocated the principle in their writings, whereas others, such as Thomas Hobbes, strongly opposed it. Montesquieu was one of the foremost supporters of separating the legislature, 
Title: Separation of powers
Content:  are designed to maintain the system of separation of powers keeping each branch in its place. The idea is that it is not enough to separate the powers and guarantee their independence but the branches need to have the constitutional means to defend their own legitimate powers from the encroachments of the other branches. They guarantee that the branches have the same level of power (co-equal), that is, are balanced, so that they can limit each other, avoiding the abuse of power. The origin of checks and balances, like separation of powers itself, is specifically credited to Montesquieu in the Enlightenment (in The Spirit of 
Title: Mixed government
Content:  became extremely popular in the Enlightenment and were discussed in detail by Thomas Hobbes, John Locke, Giambattista Vico, Montesquieu, Jean-Jacques Rousseau and Immanuel Kant. Apart from his contemporaries, only Montesquieu became widely acknowledged as the author of a concept of separation of powers (although he wrote rather on their "distribution"). According to some scholars, for example, Heinrich August Winkler, the notion also influenced the writers of the United States Constitution who based the idea of checks and balances, in part, upon the ancient theory. The constitution of Britain during the Victorian Era with a Parliament composed of the Sovereign (monarchy), a House of Lords (aristocracy) and House of Commons (democracy) is a prime example of 
Title: Separation of powers in Singapore
Content:  through checking mechanisms. A system of checks and balances serves to ensure that each power will not be subject to abuse by the controlling body. While the checking mechanisms exercised by each body should be sufficient to prevent abuse of power, they should also not overstep their boundaries and encroach upon the powers that the other branches wield lawfully. In The Federalist No. 51 (6 February 1788), James Madison wrote that "[a]mbition must be made to counteract ambition", while in The Federalist No. 48 (1 February 1788) he explained the need for a system of checks and balances in preserving the separation of powers doctrine: "... unless these departments be so far connected and blended as to give to each a constitutional control over the others, the degree of separation which the maxim requires, as essential to a free government, can never in practice be duly maintained."
Title: Separation of powers
Content:  According to the principle of checks and balances, each of the branch of the state should have the power to limit or check the other two, creating a balance between the three separate powers of the state. Each branch's efforts to prevent either of the other branches becoming supreme form part of an eternal conflict, which leaves the people free from government abuses. Immanuel Kant was an advocate of this, noting that "the problem of setting up a state can be solved even by a nation of devils" so long as they possess an appropriate constitution to pit opposing factions against each other. Checks and 
Title: Separation of powers
Content:   Separation of powers was first established in the United States Constitution, wherein the founding fathers included features of many new concepts, including hard-learned historical lessons about the checks and balances of power. Similar concepts were also prominent in the state governments of the United States. As colonies of Great Britain, the founding fathers considered that the American states had suffered an abuse of the broad power of parliamentarism and monarchy. As a remedy, the United States Constitution limits the powers of the federal government through various means—in particular, the three branches of the federal government are divided by exercising different functions. The executive and legislative powers are separated in 
Title: Separation of powers
Content:  Lord Protector was elected for life) and having checks upon each other. A further development in English thought was the idea that the judicial powers should be separated from the executive branch. This followed the use of the juridical system by the Crown to prosecute opposition leaders following the Restoration, in the late years of Charles II and during the short reign of James II (namely, during the 1680s). The first constitutional document to establish the principle of the separation of powers in government between the legislative, executive, and judiciary branches were Pacts and Constitutions of Rights and Freedoms of the Zaporizhian Host written in 1710 by Ukrainian Hetman Pylyp Orlyk.
Title: Judicial review
Content:  idea of separation of powers is another theory about how a democratic society's government should be organized. In contrast to legislative supremacy, the idea of separation of powers was first introduced by Montesquieu; it was later institutionalized in the United States by the Supreme Court ruling in Marbury v. Madison under the court of John Marshall. Separation of powers is based on the idea that no branch of government should be able to exert power over any other branch without due process of law; each branch of government should have a check on the powers of the other branches of government, thus creating a regulative balance among all branches of government. The key to 
Title: Separation of powers
Content:  Laws, 1748). Under this influence it was implemented in 1787 in the Constitution of the United States. In Federalist No. 78, Alexander Hamilton, citing Montesquieu, redefined the judiciary as a separate branch of government coequal with the legislative and the executive branches. Before Hamilton, many colonists in the American colonies had adhered to British political ideas and conceived of government as divided into executive and legislative branches (with judges operating as appendages of the executive branch). The following example of the separation of powers and their mutual checks and balances from the experience of the United States Constitution (specifically, Federalist No. 51) is presented as 
Title: Separation of powers
Content:  John Calvin (1509–1564) favoured a system of government that divided political power between democracy and aristocracy (mixed government). Calvin appreciated the advantages of democracy, stating: "It is an invaluable gift if God allows a people to elect its own government and magistrates." In order to reduce the danger of misuse of political power, Calvin suggested setting up several political institutions that should complement and control each other in a system of checks and balances. In this way, Calvin and his followers resisted political absolutism and furthered the growth of democracy. Calvin aimed to protect the rights and the well-being of ordinary people. In 1620 a group of English separatist Congregationalists 

Question: who created separation of powers and checks and balances?
Answer: Montesquieu in the Enlightenment.