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Many Americans feel themselves inferior in the presence of anyone with an English accent, which is why an English accent has become fashionable in television commercials; it is thought to sound authoritative.

Edwin Newman (1974). “Strictly Speaking: Will america be the Death of English?”
Many Americans feel themselves inferior in the presence of anyone with an English accent, which is why an English accent has become fashionable in television commercials; it is thought to sound authoritative.