RHOTICITY

 

Let me tell you about "rhoticity" (once a pedant, always a pedant) and its meaning. It has to do with the pronunciation of the /r/, which, prior to the 19th century was pronounced by all speakers of English. After that, some started dropping the sound of the /r/, saying "harder" as "ha:da:" or something similar. 

So a rhotic speaker will pronounce the /r/ whereas a non-rhotic speaker won´t. (Of course, I refer to the English /r/, not the Spanish trilled /r/.)

In general US, Canada, Ireland, Scotland, are rhotic. England, Australia, New Zealand are non-rothic. (Notice I have remarked "in general.") If you listen hard, you will get a general idea as to where the speaker you are holding hands with hails from.