National governments were never "invented" in the formal sense, yet many thinkers argue that there exists a symbolic "social contract" which lay the ground for the creation of civil societies, or governments; look at Locke and Rousseau especially for this.
The earliest known national government was seated in Ur, the capital of Sumer, the oldest known human civilization, approximately 7500 years ago; it bore little resemblance to modern governments because it was neither limited in power nor accountable to its subjects, and until the first version of the Magna Carta was signed in 1215, almost no government was.
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National governments were one of the first forms of government ever invented
I believed they are shared between state and local governments
national and state
The US Constitution.
powers denied to both national and state governments