The teachers misspelled Serbia and Romania, but expect little American kids to know where these are.
But maybe it's too much to ask of modern Americans to understand that spellings of proper nouns can and do change over time.
Remember that big hot war in the 90s?
And there was that thing in the 40s, too . . .
Ah, when the Servians shot down the invisible airplane, because they didn't see it. I remember :-)