<Li> / oʊ / is (ɜʊ ~ ɵʊ) </Li> <Li> WPA (show) <P> The Western Pennsylvania dialect, including its advanced Pittsburgh sub-type, is defined by: </P> <Ul> <Li> Cot--caught merger to (ɒ ~ ɔ), the triggering event for the Pittsburgh Chain Shift in the city itself ((ɒ ~ ɔ) ← / ɑː / ← / ʌ /) but no trace of the Canadian Shift </Li> <Li> / oʊ / is (ɜʊ ~ ɞʊ) </Li> <Li> Full--fool--foal merger to (ʊɫ ~ ʊw) </Li> <Li> Specifically in Greater Pittsburgh, / aʊ / is (aʊ ~ aː), particularly before / l / and / r /, and in unstressed function words </Li> </Ul> </Li> <P> The Western Pennsylvania dialect, including its advanced Pittsburgh sub-type, is defined by: </P> <Ul> <Li> Cot--caught merger to (ɒ ~ ɔ), the triggering event for the Pittsburgh Chain Shift in the city itself ((ɒ ~ ɔ) ← / ɑː / ← / ʌ /) but no trace of the Canadian Shift </Li> <Li> / oʊ / is (ɜʊ ~ ɞʊ) </Li> <Li> Full--fool--foal merger to (ʊɫ ~ ʊw) </Li> <Li> Specifically in Greater Pittsburgh, / aʊ / is (aʊ ~ aː), particularly before / l / and / r /, and in unstressed function words </Li> </Ul>

When did american english diverge from british english