Hawaii is a state because refueling the fleet for extended deployments required large caches of coal and lubricants.
The bases grew and our military presence was a projection of power. Midway, Pearl, Guam, Philippines, Diego Garcia, Roosevelt Roads (at el) were all in support of Naval Fleet activity.
I assert we still could have had those bases in an independent Hawaii, as we had a mutual interest in stopping Japanese domination of The Pacific.
That is part of it.
The biggest part is that native Hawaiians did not reproduce themselves.
Very few native Hawaiians remain.
As European, Japanese, and other immigrated they had big families. Methodist missionaries had large families and their descendants become wealthy landowners
By the time of the annexation of Hawaii, the biggest, most successful ranchers and farmers on the Island were Americans, mostly descendants of European ancestry. They demanded and wanted statehood. The native Hawaiian population had dwindled to a small minority.
I do not know exactly why the native population dwindled.
It may be partly from the Hawaiians being very promiscuous, and venereal disease spreading like wildfire.
One of the Hawaiian Kings got very greedy, and demanded his subjects collect sandalwood for him to sell to China.
As the amount of Sandalwood available dropped native Hawaiians worked to collect it to the exclusion of growing food.
I do not know how many Hawaiians died of European diseases, but in other areas, such as the Americas and Australia, very large percentages died of disease that came with European immigrants.
Diego Garcia is British; we just have a lease.