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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Truncus arteriosus is a rare and complex congenital (present at birth) heart defect that develops during the first eight weeks of pregnancy.Truncus arteriosus occurs when the two main blood vessels, the aorta and the pulmonary artery, stay connected and fail to separate completely as the fetus develops.Truncus arteriosus is further complicated because another congenital heart defect, ventricular special defect (VSD), occurs with it.runcus arteriosus occurs when the two main blood vessels, the aorta and the pulmonary artery, stay connected and fail to separate completely as the fetus develops. Truncus arteriosus is further complicated because another congenital heart defect, ventricular special defect (VSD), occurs with it.