jan 1, 1999 - The Longman Grammar of Spoken and Written English
The Longman Grammar of Spoken and Written English (Longman, etc.1999) produced a descriptive study of both AMerican and British English, in which each chapter follows individual spelling conventions according to the preference of that particular dialect region or version of English.
Added to timeline:
Evolution of General American English
A chronological overview of the Evolution of General America...