El Derecho constitucional es una rama del derecho público cuyo campo de estudio incluye el análisis de las leyes fundamentales que definen un Estado. Además ésta tiene la posibilidad de verse desde el punto de vista tanto formal, como material. De esta manera, es materia de estudio todo lo relativo a la forma de Estado, forma de gobierno, derechos fundamentales y la regulación de los poderes públicos, incluidas las relaciones entre los poderes públicos y ciudadanos.

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Constitutional law is the body of law which defines the relationship of different entities within a state, namely, the executive, the legislature, and the judiciary. Not all nation states have codified constitutions, though all such states have a jus commune, or law of the land, that may consist of a variety of imperative and consensual rules. These may include customary law, conventions, statutory law, judge-made law, or international rules and norms. Constitutional law deals with the fundamental principles by which the government exercises its authority. In some instances, these principles grant specific powers to the government, such as the power to tax and spend for the welfare of the population. Other times, constitutional principles act to place limits on what the government can do, such as prohibiting the arrest of an individual without sufficient cause. In most nations, including the United States, constitutional law is based on the text of a document ratified at the time the nation came into being. Some constitutions rely heavily on unwritten rules known as constitutional conventions; their status within constitutional law varies, and the terms of conventions are in some cases strongly contested.

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