26th century American

Consonants

 * /ɽ/, /ɽ̃/, & /ʁ/ only occur intervocalically except in loanwords.

Vowels

 * Vowels are nasalized when adjacent to /m/, /n/, or /ɽ̃/.
 * Diphthongs are /eʊ/, /aɛ/, & /oɛ/.