I am from New England (northeastern US) and it's my understanding that we have a non-rhotic dialect in this region, which is unusual compared to the rest of the US. It is common to drop the final r ...
My grandmother, who grew up in western Pennsylvania, pronounced wash and Washington with an intrusive R: “warsh” and “Warshington.” Where does the intrusive R come from in that dialect? It doesn’t ...
For example, the r in "better" is not pronounced in British English. How about the "r" in "a better idea"?