Where is Taishanese the dominant divergent of Cantonese phonology most spoken in North America?
Taishanese:  In the late 19th century and early 20th century, a significant amount of Chinese emigration to North America originated from this four-counties area called Sze Yup, making Toishanese a dominant variety of the Chinese language spoken in Chinatowns in Canada and the United States.
i don't know