Whoopie pie originated in which country?

I live in Colorado and have never heard of it. Strangely, the Mississippi River seems to be a dividing line with a lot of things.

Player Say what!?, I now live in Colorado. Some groceries are not common here.

Oh man they are to die for ❤️

Is that the same as a moon pie?

Heard of it but never tried it, the name sort of sounds wrong to me, sounds nice though 😀