from PART I - The United States
Published online by Cambridge University Press: 15 April 2026
With a focus on Western American English vowel systems, this chapter examines the formative influences on the Western US dialect region, framing the current uniformity in vocalic patterns as the outcome of koineisation. Using early written sources and dialect atlas projects, we trace the routes of early colonisation of and the dialect inputs into the region, focusing particular attention on California, Nevada and Oregon. We also draw empirically from acoustic vowel data from modern and historical recordings in an attempt to consider how the information we have about Western speech at different time points over the past 150 years fits with leading models of new dialect formation. Our account of the spread of English westward argues that levelling and simplification were set in motion in the mid-1800s in large part owing to the confluence of American English varieties brought with the earliest settlers. Further, it was likely the instability of the low vowel system across these dialects that laid the foundation for the modern Western koine.
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