Is there a logical reason why we use "a" to describe the adjective "united" instead of "an"?

I was trying to write the sentence, "if he/she is not an United States citizen..."Compared to this sentence that I know is correct, "she was an electr

I was trying to write the sentence, "if he/she is not 'an' United States citizen..."
Compared to this sentence that I know is correct, "she was an electrifying girl."

or:I was trying to write the sentence, \"if he/she is not 'an' United States citizen...\"Compared to this sentence that I know is correct, \"she was an electrifying girl.\"


or:I was told it's because 'united' is pronounced with a 'y as in yellow' sound. Since the sound is a consonant sound it gets the 'a'. Words like animal start with a vowel sound and therefore are preceded by 'an'. So the rule is go by the sound and not the actual letter.


or:Yes and no. Language is not built, it grows. The way we talk depends on the way we talk. Maybe that's logical and maybe it's not. In Japan the general rule is \"always a vowel between two consonants\

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