Welfare and voting fraud. The Democrats refused to admit Alaska to the Union until the Republicans agreed to admit Hawaii. At the time, Alaska was reliably Republican, and Hawaii was reliably Democrat.
And the Democrats were developing their habit of putting minorities on the welfare plantation, and admitting more immigrants from third-world countries, or countries whose citizens were likely to vote Democrat.
Machine politics has always run rampant in Hawaii. So they liked the idea of pretending that illegal aliens were citizens, even back then.
Well, okay, but in the 1960s when the federal officials asked the Hawaiian officials about Barack Obama that process wouldn’t have gotten very far yet, so the probability that officials would have lied was far less than it might be at a later date. Things were a lot stricter when we still had the draft and the FBI had teeth and wasn’t afraid to use them and “sanctuary cities” were barely conceivable.