"Fuck 'em, we didn't want their votes anyway."

Quite the stretch. There really isn’t any comparison to be done between a war of foreign aggression and a civil war in this context.

As I said elsewhere, the effect of denying the centralized government the ability to offer elections in occupied territory is the same.

Also didn’t the US allow a third time for Roosevelt during WWII for much the same reasons?

There was no law at the time limiting the number of terms presidents could win.