Smart/Dumb Rednecks

A Tennessee couple- Dave and Rebecca Kosmitis both bona fide rednecks, had 9 children.
They went to the doctor to see about getting Dave 'fixed.' The Doctor gladly started the required procedure and asked them what finally made them make the decision. why, after 9 children, would they choose to do this?
Dave replied that they had read on a recent article that 1 out of every 10 children being born in the united states was mexican, and they didnt want to take a chance on having a mexican baby because neither of them could speak spanish.