This is notable because the Constitution "officially" took effect on June 21, 1788 when New Hampshire became the 9th ratifying state. When the Confederation Congress last met, only North Carolina and Rhode Island were holdouts.
That would seem to imply that for a very brief period of time, the U.S. actually had two concurrent national governments with the old transferring its power to the new. The non-ratifying states such as Rhode Island would presumably have been bound only to the old government until their ratification of the new.
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