That is not southern at all I was raised in Des Miones Iowa and my dad ate corn bread in milk and he did not have milk he would put in his coffee (gross), crackers in milk
if it was any kind of bread he would soak it in milk.
Nor is it midwestern, but rather something that was popular among Americans during the late 19th and early 20 century. Maybe more so in rural/farming areas.
When I was a teenager just day ago (lol) my favorite breakfast was to crumble up a couple pieces of brad into a pot add milk, brown sugar and cinnamon.
Must get back into that......I feel younger already!
My uncle (from Alabama) filled his glass with corn bread chunks and buttermilk.
When my sister and I were little, sometimes we ate broken up corn bread like cereal, with a little sugar and milk on it. We also sometimes ate left over rice that way (only with a little cinnamon as well).
mmmm I love this! When I was little and my mom made cornbread she'd have to make two batches. One to eat as cornbread and one to put in milk and eat. Nummers!