Thanks.
I found another issue. When the error checker found the location "Ma, usa", it recommended changing it to "GA, USA." That's terribly wrong. "Ma." (MA in the modern postal system) is an abbreviation for Massachusetts and Ga. (GA in the modern postal system) is an abbreviation for Georgia. Very different places!
Furthermore, these two-letter codes shouldn't be recommended for continued use."Ma, USA" should become "Massachusetts, USA" and "Ga, USA" should become "Georgia, USA" (assuming that the dates are after the USA existed -- the profile where I saw the "Ma, usa" was for a date around 1700, before there was a USA).
PS - Are any other two-letter codes being "corrected" in this fashion? I hope we're not also encouraging people to change Pa (Pennsylvania) or Va (for Virginia) to Ga for Georgia, etc., or we'll be creating a new mess...