All the land in the United States was stolen from indigenous people, Ive heard many arguments as to what should happen to this land from balkanization, giving back power to tribal governments, or just doing what the USSR did and making a USSA. I dont know the answer for what to do with the interior states, I think leftists are more concerned about weakening the power of US imperialism than dealing with the issue of drawing borders for a post-capitalist United States, but Hawaii is special.
There are not many places in the United States where outright secession is a leftist goal, Hawaii is unique in that it was a nation until relatively recently, it was annexed long after the Americans manifest destinied their way across the continent. Hawaii had a central government, it had a monarchy, it engaged in capitalism and industrialization on a far greater level than any Native American tribe did. With tribes in the United States it can be hard to determine how they can have an independent state after so much displacement and cultural genocide, Hawaii is different, they have the greatest capacity of becoming an independent nation out of any colonized territory.
Im simplifying a complex issue by saying Hawaii can be independent if they kick out the military and tourists, thats certainly easier said than done. They could also nationalize all the farms, get rid of the golf courses and highways, and try to begin to fix their already fucked up water supply and invasive species problems. Hawaii could become the Pacific Cuba. The only group that could do such a thing ironically are monarchists, which is strange because we don't really think of them as leftist but in Hawaii's case they are. Strange bedfellows, I for one want to see monarchal communism (does North Korea count as that?)