In 1959, when Hawaii was admitted as a state, there was a referendum and more than 93% of the voters were in favor of the admission. The attendance was more than 90% of the registered voters [1].

That to me shows a lot of enthusiasm for joining the US.

But of course, 60 years later, you can always find some vocal minority with a nostalgia for an idyllic past that never existed.

[1] https://en.wikipedia.org/wiki/Hawaii_Admission_Act