The establishment of a new city or county is an example of reserved power.
A reserved power is a political power that is designated by a constitution for the sole jurisdiction of a specific political institution.
The Tenth Amendment of the United States Constitution states that any power not explicitly delegated to the federal government rests completely with the states.
The Supreme Court has routinely rejected claims that challenge the reserved powers of the federal government since World War II. It also includes the reserved power to establish a new city or county.
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