Western American English in the context of "Atlas of North American English"

General American English, known in linguistics simply as General American (abbreviated GA or GenAm), is the umbrella accent of American English used by a majority of Americans, encompassing a continuum rather than a single unified accent. It is often perceived by Americans themselves as lacking any distinctly regional, ethnic, or socioeconomic characteristics, though Americans with high education, or from the (North) Midland, Western New England, and Western regions of the country are the most likely to be perceived as using General American speech. The precise definition and usefulness of the term continue to be debated, and the scholars who use it today admittedly do so as a convenient basis for comparison rather than for exactness. Some scholars prefer other names, such as Standard American English, though this can be a wider term encompassing more than just accent.

Standard Canadian English accents may be considered to fall under General American, especially in opposition to the United Kingdom's Received Pronunciation. Noted phonetician John C. Wells, for instance, claimed in 1982 that typical Canadian English accents align with General American in nearly every situation where British and American accents differ.

Pacific Northwest English (also known, in American linguistics, as Northwest English) is a variety of North American English spoken in the U.S. states of Washington and Oregon, sometimes also including Idaho and the Canadian province of British Columbia. Due to the internal diversity within Pacific Northwest English, current studies remain inconclusive about whether it is best regarded as a dialect of its own, separate from Western American English or even California English or Canadian English, with which it shares its major phonological features. The dialect region contains a highly diverse and mobile population, which is reflected in the historical and continuing development of the variety.

The Low-Back-Merger Shift is a chain shift of vowel sounds found in several accents of North American English, beginning in the last quarter of the 20th century and most significantly involving the low back merger (which collapses together the low-back vowel sounds: /ɑː/, /ɒ/, and /ɔː/ in words like PALM, LOT, and THOUGHT respectively) accompanied by the lowering and backing of each of the front-lax vowels: /æ/, /ɛ/, and /ɪ/ (in words like TRAP, DRESS, and KIT respectively).

The back and downward movement of all the front lax vowels was first noted as distinguishing certain California English speakers in 1987, and it was soon known by linguists as the California Vowel Shift. Then, it came to distinguish certain Canadian English speakers in a 1995 study, now known in that variety as the Canadian Shift; today, it helps define Standard Canadian English. The California and Canadian Shifts were initially reported as two separate phenomena, but the same basic pattern was next documented among some younger varieties of Western New England English, Western American English, Pacific Northwest English, and Midland American English, all in speakers born from the 1980s onward. Linguists have proposed possible relationships between the low back merger and the similarly structured shifts in these regional dialects, though no unifying hypothesis is dominantly agreed upon yet. Assuming the similar chain shifts found in Canada and various parts of the U.S. have a single common origin, a variety of names have been proposed for this trans-regional chain shift which, besides the low-back-merger shift, include the Third Dialect Shift, Elsewhere Shift, Short Front Vowel Shift, and North American Shift.