DECOLONIZATION

What about regaining full independence (soveteignty) through decolonization or deoccupation? This has happened many many times over the past 300 years. There are many ways this can happen.  Each case is unique. Scotland recently had a plebiscite about independence from Great Britain. They decided to stay,  for now 

Some other examples include: Tahiti, Samoa, New Zealand, Australia, Ireland, Canada, Cyprus, Greece, Egypt, Mexico, Bulgaria, Serbia, Romania, India, Panama, Haiti, Cuba, Dominican Republic, the Philippines, and (ironically) the USA herself. There are other examples of sovereignty obtained through decolonizatiom. There is no reason it could not happen here in Hawaii as well.

See:

https://en.m.wikipedia.org/wiki/Decolonization