[samatman]

I disagree, I think it was 95% being a de-facto island and shutting down international travel without aggressive quarantine upon arrival.

Why, you ask? Well I was living in Hawaii during the pandemic, we're Americans, and we had very similar results through the end of June 2020, nearly extirpated the virus in fact.

Unfortunately the US Military couldn't be compelled to follow restrictions, and a huge outbreak in Pearl Harbor escaped containment and ruined all that hard work.