I’ve recently found the answer to a question that has been raised on Keepa … but now I can’t find where we’ve talked about this before to link to it.
The question was about the change in vocabulary from “Conference” to “District,” referring to the organization of missions. The answer is found in a 1927 letter:
March 12th, 1927
Presidents of Missions:
Please be advised that the First Presidency and Council of the Twelve Apostles have recently made a ruling to the effect that the word “District” shall be substituted for the word “Conference,” when referring to a territorial division of a Mission.
We shall be pleased therefore to have you conform to this change in the future.
Sincerely your brethren,
Heber J. Grant