The central government of the United States is called a republic that abides by the governing document called the US Constitution. This government is divided into three parts. A judicial, executive and legislative part. Federal power is equally divided between these "branches" to insure that no single branch can dominate any of the other branches. The US is a democratic nation where important political leaders are either directly or indirectly voted into office by the US voting public.
The Constitution establish a federal system of government for the United States.
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The noun form of unite is unity
The United States government is not trying to unite 13 separate states.
I think it unite in 1932
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NATIONAL SOVEREIGNTY is the proper term for the power of a nation-state to determine its form of government economic and social systems.
state constitutions