A country which consists of semi-autonomous units which are unified by a common central government has a federal system. Apart from the United States, Canada, Australia, and South Africa all have federal systems. One of the most interesting federal systems is that of Switzerland, which is remarkable because of the relative weakness of the central government as compared to the cantons (the units within the federation.
Constitution
The federal system political system is divided between the national government and regional government. The united states is a federal republic.
The 2nd level in the United States of America's federal government system is state governments. Though state governments are sovereign from the federal government, they are considered to be part of it.
The United States is a federal, constitutional, democratic, presidential republic.
A unitary government holds all power at, what we call in the United States, the federal level. There are no issues that the federal government cannot deal with. The opposite of unitary government is the federal government, meaning that there are multiple levels of government. The United States is a federal system of government, with power being shared between the state and federal governments.
Federalism is a system of government where power is divided between the federal government and the states. The United States would be an example of this kind of government.
The Constitution establish a federal system of government for the United States.
The United States political system is a Constitutional Federal Democratic Repuplic
confederate
The power-sharing between a central government and those of the individual states is a federal government.
The "Federal Government" or "National Government" known generally as "The United States of America" was seen as necessary to prevent human rights violations (a slide into the former governmental practices from England) at the time it was created.
The same of the United States: all three countries are federations of independent states with a federal government of elected officials.