I don't have much of any accent at all in my voice. And I live in a province where everyone is supposed to sound Irish or Scottish and people "from away", as it's called around here, have a hard time understanding us. It's like a stereotype, and yet people seem to think you don't have any culture or you're not proud of your heritage if you don't act like the stereotypes. I hate that. I especially hate the stereotype that we will drink you under the table and love seafood. I'm a teetotaler and I've never developed a taste for seafood. Blech!
My parents, on the other hand, are about as Nova Scotian as they come. Especially my dad. Not that long ago I noticed he pronounces words that start with "th" like the "h" doesn't exist. For example he'll say " I'll see you at tree-tirty" instead of "three-thirty". I find it amusing.
Actually, when I was in maybe grade 1, I had some trouble pronouncing the "th" sound, which got my teacher very frustrated with me. Now I think it wasn't really my fault, that was just how I'd always heard it from my parents.
And once when I was younger, a boy thought I was from New York! He said I sounded like him, and he was from New York. Maybe it was just because I had a tendency to speak loudly?
Interesting.
Boston, and New York City, have many Irish descent folks, and many Irish nationals still shuttle between those places and Ireland to work. So the speech of those areas probably has a similar Irish influence to that of Nova Scotia. Being "th impaired" might be an Irish thing. I dunno. Every language has sounds other languages dont have. Irish might lack the TH sound of English.