Ah, the bad old “th” sound! I teach ESL and I know that is a problem for a lot of people. It is a problem for some Chicagoans, too. Da Bulls!
Why is it when I visit Toronto I encounter numerous Arabs, Indians, Chinese, Africans, etc., who don’t speak either French or English? Try to order in English in a ChinaTown restaurant. Our immigration standards are a farce.
A lot of the old city regional accents were based on the Irish accent. “Da,” (The) “Tirty Tird and Tird” (Thirty Third and Third Street). Alas, it’s being displaced by other accents.