Question: Where is Taishanese the dominant divergent of Cantonese phonology most spoken in North America?

Context paragraphs:
Subgum: Subgum or sub gum (traditional: 什錦; simplified: 什锦; Cantonese: sap gam; pinyin: shí jǐn; literally "numerous and varied") is a type of American Chinese dish in which one or more meats or seafood are mixed with vegetables, and sometimes also noodles, rice, or soup.  It originates from Cantonese cuisine and is a commonly encountered dish on the menus of Chinese restaurants in North America.

Juan de Fuca Ridge: The Juan de Fuca Ridge is a mid-ocean spreading center and divergent plate boundary located off the coast of the Pacific Northwest region of North America.  The ridge separates the Pacific Plate to the west and the Juan de Fuca Plate to the east.  It runs generally northward, with a length of approximately 500 kilometers (300 miles).  The ridge is a section of what remains from the larger Pacific-Farallon Ridge which used to be the primary spreading center of this region, driving the Farallon Plate underneath the North American Plate through the process of plate tectonics.  Today, the Juan de Fuca Ridge pushes the Juan de Fuca Plate underneath the North American plate, forming the Cascadia Subduction Zone.

Navajo language: Navajo or Navaho ( ; Navajo: "Diné bizaad" or "Naabeehó bizaad" ) is a Southern Athabaskan language of the Na-Dené family, by which it is related to languages spoken across the western areas of North America.  Navajo is spoken primarily in the Southwestern United States, especially in the Navajo Nation political area.  It is one of the most widely spoken Native American languages and is the most widely spoken north of the Mexico–United States border, with almost 170,000 Americans speaking Navajo at home as of 2011.  The language has struggled to keep a healthy speaker base, although this problem has been alleviated to some extent by extensive education programs in the Navajo Nation.

Gray fox: The gray fox ("Urocyon cinereoargenteus"), or grey fox, is a carnivorous mammal of the family Canidae ranging throughout most of the southern half of North America from southern Canada to the northern part of South America (Venezuela and Colombia).  No other canid's natural range spans both North and South America and it is the only American canid that can climb trees.  This species and its only congener, the diminutive Channel Island fox ("Urocyon littoralis"), are the only living members of the genus "Urocyon", which is considered to be the most basal of the living canids.  Though it was once the most common fox in the eastern United States, and still is found there, human advancement and deforestation allowed the red fox to become more dominant.  The Pacific States still have the gray fox as a dominant.  Its specific epithet "cinereoargenteus" means "ashen silver".

North American English regional phonology: North American English regional phonology is the study of variations in the pronunciation of spoken North American English (English of the United States and Canada), though studies of regional dialects can be based on multiple factors, including phonological (abstract sound-based), phonetic (physical sound-based), lexical (vocabulary-based), and some syntactic (grammar-based) factors.  North American English includes American English, which has several highly developed and distinct regional varieties, along with the closely related Canadian English, which is more homogeneous.  American English (especially Western dialects) and Canadian English have more in common with each other than with varieties of English outside North America.

Taishanese: Taishanese, or in the Cantonese romanization Toishanese (; Taishanese: ] ), is a dialect of Yue Chinese.  The dialect is related to and is often referred to as Cantonese but has little mutual intelligibility with the latter.  Taishanese is spoken in the southern part of Guangdong Province in China, particularly around the city-level county of Taishan located on the western fringe of the Pearl River Delta.  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.  It was formerly the lingua franca of the overseas Chinese residing in the United States.

Cantonese phonology: The standard pronunciation of Cantonese is that of Guangzhou, also known as Canton, the capital of Guangdong Province.  Hong Kong Cantonese is related to the Guangzhou dialect, and the two diverge only slightly.  Yue dialects in other parts of Guangdong and Guangxi provinces, such as Taishanese, may be considered divergent to a greater degree.

Blackfoot language: The Blackfoot language, also called Siksiká (ᓱᖽᐧᖿ, its denomination in ISO 639-3), ( ; ], ᓱᖽᐧᖿ ), often anglicised as Siksika , is an Algonquian language spoken by the Niitsitapi people, who currently live in the northwestern plains of North America.  There are four dialects, three of which are spoken in Alberta, Canada, and one of which is spoken in the United States: "Siksiká" (Blackfoot), to the southeast of Calgary, Alberta; "Kainai" (Blood, Many Chiefs), spoken in Alberta between Cardston and Lethbridge; "Aapátohsipikani" (Northern Piegan), to the west of Fort MacLeod; and "Aamsskáápipikani" (Southern Piegan), in northwestern Montana.  The name Blackfoot probably comes from the blackened soles of the leather shoes that the people wore.

Palatine German language: Palatine German or Pfaelzisch ("Pälzisch"; German: "Pfälzisch" ) is a West Franconian dialect of German which is spoken in the Upper Rhine Valley roughly in an area between the cities of Zweibrücken, Kaiserslautern, Alzey, Worms, Ludwigshafen am Rhein, Mannheim, Heidelberg, Speyer, Landau, Wörth am Rhein and the border to the Alsace region in France but also beyond.  Pennsylvania German, or Pennsylvania Dutch is descended primarily from the Palatine German dialects spoken by Germans who immigrated to North America from the seventeenth to the nineteenth centuries and who chose to maintain their native language.  Danube Swabians in Croatia and Serbia also use many elements of it.  Normally, one distinguishes the Pfälzisch spoken in the western part of the Palatinate (Westpfälzisch) and the Pfälzisch spoken in the eastern part of the Palatinate (Vorderpfälzisch).  Some examples of the differences between High German and Pfälzisch are:

West Coast Conference on Formal Linguistics: The West Coast Conference on Formal Linguistics, or WCCFL (pronounced /ˈwɪkfəl/) is an annual linguistics conference, usually held in the spring, at an institution in western North America.  Presentations can focus on any aspect of natural language analysis, including, but not limited to, phonetics, phonology, morphology, syntax, semantics and discourse structure.

Supporting paragraphs: Cantonese phonology Taishanese
Answer: Chinatowns