A Comm for Historymemes

By and large, yeah. Although it got it's start with world war one rationing, proved handy during the depression and then through the second world war.
Once you're at 30-40 years a recipe can become a "family recipe" pretty easily and then it lasts even longer.

The spice thing is because in the 1800s a lot of the religions that were most prevalent in the area condemned "pleasures of the flesh" as sins only fit for "dirty, sensual Catholics enthralled to the Pope". Looking at you, Italians. 🤨. You can see it in things like corn flakes, the cereal designed to be nutritional and the worst, or graham crackers, the least masturbatory cracker.
It's why so many of the biggest cereal manufacturers are from the Midwest and have insane history.

Don't be too hard on the hot dish though, a lot of them have evolved towards a sorta reinvention of Shepard's pie or scalloped potatoes.
"Minced meat with vegetables topped with potatoes" and "potatoes mixed with a thickened cream topped with cheese".

Green bean and tuna noodle casserole are not for me though.