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All that is in red/brown is a single country called the United States of America.
In this hypothetical-utopian country with the main POD between 1770 and 1790. These United States have the original Thirteen Colonies in addition to that expanded to the north, west and south with purchases and cession of territories until 1925.
If we take the current OTL borders of the Caribbean and Central America in addition to the national sub-visions of Mexico, Canada and the USA of OTL, there would be between 110 and 125 entities.
How many states could this country have maintaining an acceptable number?