My US-born wife points out that since it was not until 1776 – or, strictly speaking 1781, the end of the Revolutionary War – that the United States (as we now know it) came into being, he should more correctly be referred to as ‘American-born’.
To paraphrase the Duke of Plaza-Toro in Gilbert & Sullivan’s The Gondoliers: “It’s only a small matter; still, one may as well get it right.”
Wilfrid de Freitas
PS I hope you will excuse the salutation. I just can’t bring myself to say ‘Madam’. Too many unfortunate connotations on this side of the Atlantic.