jcb wrote: ↑Thu Jul 31, 2025 10:25 pm
Travis B. wrote: ↑Thu Jul 31, 2025 5:20 pm
Darren wrote: ↑Thu Jul 31, 2025 4:44 am
American dialects have pretty much all unrounded LOT, shortened long vowels and smoothed diphthongs, but they retain rhotics.
As for shortened long vowels, I would say that many of the long vowel phonemes of EngE/AusE/NZE never developed in the first place in rhotic NAE varieties, and what vowel length distinctions were inherited were obliterated by the simultaneous lengthening of short vowels before lenis obstruents.
Do we know when the new vowel length system (lengthening of vowels before voiced obstruents) in NAE evolved?
What we do know is that vowel length allophony, in one form or another, is common to both English and Scots as a whole, so it must date back quite far in history.
However, in EngE/AusE/NZE it takes the form of
clipping, i.e. the shortening of vowels before
coda fortis obstruents. This results in a pattern where, depending on the details, there may be as many as four different possible realized vowel lengths in any given syllable.
The innovation in the case of NAE appears to be extending it to a general pattern of where a fortis obstruent after a vowel (ignoring any intervening sonorants) results in a short vowel and all other cases except utterance-finally vowels are long, so as to eliminate the historical phonemic vowel length altogether.
I have not read anything about the details of when the modern NAE pattern was innovated; it could be rather old, considering that it appears to be common to present-day NAE, but sound changes in historically widespread distinctions can become universal within a short period of time (e.g. /w/ and /ʍ/, while being a historically widespread distinction, may become completely merged in NAE within a generation, as shown by being found in many spread-out relict speakers across all of NAE while being almost universally merged amongst younger speakers).