The third major system is the federal system. In a federal system, the national government holds significant power, but the smaller political subdivisions also hold significant power. The United States, Canada, Australia, and Brazil are examples of federal systems.ederalism is not mentioned explicitly in the Constitution, but federalism is one of the many concepts that the Constitution embodies. There are three major types of government in the place in the world today. The most prevalent is the unitary system.
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The inferior vena cava (or IVC) (Latin: vena, vein, cavus, hollow), is one of the venae cavae, two large veins, that carries deoxygenated blood from the body into the right atrium of the heart.n the embryo, the inferior vena cava and right atrium are separated by the valve of the inferior vena cava, also known as the Eustachian valve. In the adult, this valve typically has totally regressed or remains as a small fold of endocardium.