That’s an interesting observation. That styles of speaking for announcers changed from the assertive to the grandfatherly and comforting.
FDR’s accent was interesting. I can’t say exactly what it was.
I taught a seminar once and in it were three young women from various parts of the country and they all spoke exactly alike -— that awful Valley Girl accent. One was Janapese-American from Hawaii, one was a native-born San Antonian (Texas) and a third was from Michigan. They all spoke Valley Girl.
It has become the standard.
As for the NY accent in New Orleans, there is a Deep South way of speaking that says ‘choice’ for church and ‘noisse’ for nurse. That is in Mississippi and new Orleans both.
It seems to me there is a coastal pehnomenon of lack of R’s -— final r’s at any rate, that streches from New Jersey to New Orleans, right around the lowland coasts of the Atlantic.
But I am no expert.
I once got off a train in Jacksonville Mississippi andthe taxi driver that had been sent to pick me up said, as I thought ‘How was your dead rat?’
I finally figured out he was saying ‘How was your train ride?’
The sad thing is, every woman under 30 in Manhattan, whether she be from Scarsdale or Dallas originally, talks, "like, oh my gaaahD!" I blame television for the spread of Val-speak.