@sayrer@mastodon.social @robert@mastodon.social Yes and no. I would say it's more dialect than diction, as there are points in favor of each. Names are ephemeral, but what is now called "General American English" was once called "Midwestern Broadcast English", because it was assumed to be the most generic form that all Americans relate to.
(And a current web search shows no immediate results for midwestbroadcast in this context, but I know I have some references in old linguistic textbooks to this. Language is a living thing and constantly in flux.)