The national government of the united states is a ''constitutional'' one, in that it has specific limits on what it can control, and how it can exercise such control.
The presence of a constitution, which may be a written document or just a set of fixed standards or principles commonly acknowledged as the fundamental law of the polity, that effectively control and regulates the exercise of political power defines a constitutional government.
The world's oldest surviving written charter of government is the United States Constitution. The opening three words of it, "We The People," declare that the purpose of the American government is to serve its people. Constitution has mention all the power of government and limit the area of government that is why U.S has a constitutional government.
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