Commonwealth is a region that has its own elected government and voluntary associates itself with the united states.
"A commonwealth refers to any group of people organized under a single government, particularly a republic." The commonwealths are just like any other state in their politics and laws, and there is no difference in their relationship to the nation as a whole.
The reason some states are called commonwealths is because when their constitutions were drafted, they referred to themselves as such. There are four states in the United States that call themselves commonwealths: Kentucky, Massachusetts, Pennsylvania.
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