It’s telling, that halting moment when someone from the U.S. tries to say “an historic.”
There is an odd beat. A reminder that something in the pronunciation doesn’t quite fit. Because for us, it doesn’t.
The rule is actually a holdout from British English, where many dialects drop the h’s that preceded vowels.
In that case, requiring “an” before a silent h makes sense. “An ‘istoric” night sounds right, and rolls off the tongue easier.
In the U.S., however, we use a hard h for this word. So the rule doesn’t make any sense.
Imagine saying “She had an hysterectomy,” or “It’s an hysterical movie.”
It sounds ridiculous, right? Just as ridiculous as forcing “An historic night.”
So, I refuse to say it. And I hope whoever governs grammar starts to understand why we don’t need to enforce this out-of-date rule.