Explain why the idea of granting independence to any of the 50 states, including Hawaii, is not legally viable in the United States.
Actually the US simply cannot grant independence to any of the 50 states because there is no avenue in US law to do so. That was settled by the Civil War 150 years ago and confirmed by the Supreme Court in Texas v. White in 1869. Since there is no legal option, either nationally or internationally, the only path would be revolutionary violence and I personally have never met anyone in any group in Hawaii so foolish as to advocate that suicidal idea.