Only if your ' USA' is a single colony, with the rest of the 13 in some other organization(s) with a different name.
Really. The word 'state' means 'independent' country. The initial conception of the US was a lot like the modern EU. No way, no how are you going to get a unitary state out of the original 13.
Under a democratic regime, no, but under a dictatorship, I think it could easily be possible. Other nations (Austria-Hungray, Prussia, Spain, the Ottoman Empire) held together far more factitious and diverse empires as unitary states. As I said before, a Federalist victory in 1796 or 1800 would lead to a trend of greater centralization of authority and power. That, combined with Hamilton killing Burr (better Federalist leadership), and with a Bonaparte-style military coup maybe 30 or 40 years down the line, could lead to a de-facto unitary state, with state governments still existing but having little to no power. it would look a little like modern Brazil's federation.
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