Yes , it should be public knowledge that the potato stems from South America , not European . .
Since it is widely acknowledged that the USA , probably from 1800 on , has had a strong Irish influence ( American English as it is spoken today , the American 'hillbilly'-cliche of the 1800s , lol , etc . .) it isn't surprising that the Irish were in favour of 'fruits from the New World' . . .
They were so used to it . .