The definition of a superstate is -- > a federation of established nations formed to create a larger, more powerful political entity.
Virginia and Connecticut were never rival nations with separate languages, Constitutions, caste systems, etc. Every nation has its social diversity, but we don't argue that Ontario is a nation separate from Nova Scotia.
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Many civil wars have occurred in the world's history; ours was arguably the most morally 'righteous' civil war ever fought.
Yes, civil wars occur. How do you get from there towards your suggested imperative to coalesce the world's peoples into smaller and more powerful blocs?
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Sometimes individual nations do prosper greatly. Difficult also to see why this creates an imperative for other nations to form power blocs against them to the extent that those countries' identities are lost.
It is not as though the U.S. might imminently destroy Japan in a war. Even if it were, N.A.T.O. did just fine against the Soviet Union without inventing the Euro.
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But with Brexit, I thought we were talking about frictionless trade, to benefit the economically disadvantaged. Is this the real issue, cutting the U.S. down to size? :- )