The truth is that Hawaii is the 50th state because America says so.  The United States, a rogue nation that is not subject to international law and is currently bombing 6 countries right now, does not recognize the existence of any "lawful Hawaiian Kingdom government."  They recognize the State of Hawaii as the sovereign authority in all matters of jurisdiction in which the federal government is not explicitly granted higher authority as per the US Constitution.  ll of the states are considered sovereign by US law.  

The bottom line is this:  America claims Hawaii and is willing to fight and kill for it.  You're not.  Therefore, of course, Americas claim is the one that matters, since they are able to enforce their claim, whereas you can only pretend.  No different than the Falkland Islands.  Property claims not backed up by force are completely imaginary.  Besides, if it came to a vote (which wouldn't matter, because states aren't allowed to leave the Union), you'd lose anyway.