The phonology of the open back vowels of the English language has undergone changes both overall and with regional variations, through Old and Middle English to the present. The sounds heard in modern English were significantly influenced by the Great Vowel Shift, as well as more recent developments in some dialects such as the cot–caught merger.
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Father–bother merger in the context of Western New England English
Western New England English refers to the varieties of New England English native to Vermont, Connecticut, and the western half of Massachusetts; New York State's Hudson Valley (from Albany to Poughkeepsie) also aligns to this classification. Sound patterns historically associated with Western New England English include the features of rhoticity (full pronunciation of all r sounds), the horse–hoarse merger, and the father–bother merger, none of which are features traditionally shared in neighboring Eastern New England English. The status of the cot–caught merger in Western New England is inconsistent, being complete in the north of this dialect region (Vermont), but incomplete or absent in the south (southern Connecticut), with a "cot–caught approximation" in the middle area (primarily, western Massachusetts).
Western New England English is relatively difficult for most American laypersons and even dialectologists to identify by any "distinct" accent when compared to its popularly recognized neighbors (Eastern New England English, New York City English, and Inland Northern U.S. English), meaning that its accents are typically perceived as unmarked "General American" varieties. Linguistic research, however, reveals that Western New England English is not simply one single or uniform dialect. Linguist Charles Boberg proposes that it be most generally divided into a Northwestern New England English (a standalone "Vermont" accent) and a Southwestern New England English (a less advanced subdialect of Inland Northern English); however, even Boberg lists the possibilities of several distinct accent divisions of Western New England.
Father–bother merger in the context of Cot–caught merger
The cot–caught merger, also known as the LOT–THOUGHT merger or low back merger, is a phonological phenomenon present in some dialects of English where speakers do not distinguish the vowel phonemes in words like cot versus caught. Cot and caught, along with bot and bought, pond and pawned, etc., are examples of minimal pairs that are lost as a result of this sound change; i.e. each of these pairs of words is pronounced the same. The phonemes involved in the cot–caught merger, the low back vowels, are typically represented in the International Phonetic Alphabet as /ɒ/ and /ɔ/ or, for United States English, as /ɑ/ and /ɔ/. The merger is typical of most Indian, Canadian, and Scottish English dialects as well as some Irish and U.S. English dialects.
An additional vowel merger, the father–bother merger, which spread through North America in the eighteenth and nineteenth centuries, has resulted today in a three-way merger in which most Canadian and many U.S. accents have no vowel difference in words like PALM /ɑ/, LOT /ɒ/, and THOUGHT /ɔ/.
Father–bother merger in the context of Eastern New England English
Eastern New England English, historically known as the Yankee dialect since at least the 19th century, is the traditional regional dialect of Maine, New Hampshire, and the eastern half of Massachusetts. Features of this variety once spanned an even larger dialect area of New England, for example, including the eastern halves of Vermont and Connecticut for those born as late as the early twentieth century. Studies vary as to whether the unique dialect of Rhode Island technically falls within the Eastern New England dialect region.
Eastern New England English, here including Rhode Island English, is classically associated with sound patterns such as: non-rhoticity, or dropping r when not before a vowel; both variants of Canadian raising, including a fairly back starting position of the /aʊ/ vowel (as in MOUTH); and some variation of the PALM–LOT–THOUGHT vowel distinctions, the marry–merry distinction, or both. Eastern New England (excluding Rhode Island) is also nationally recognized for its highly front PALM/START vowel. The most well-known subsets include Boston accents, Maine accents, and a cultivated or elite accent, sometimes known as a "Boston Brahmin accent" within Boston, that was associated with wealthy New England families in the late 19th and early 20th centuries.