Thinking Ahead

A Tennessee couple, Dave and Rebecca, both bona fide rednecks, had 9 children.
They went to the doctor to see about getting Dave ‘snipped.’ The doctor gladly started the required procedure and asked them what finally made them make that decision. Why, after 9 children, would they choose to do this?
Dave replied that they had read in a recent article that 1 out of every 10 children being born in the United States was Mexican, and they wouldn’t want to take that chance on having a Mexican baby because neither of them could speak Spanish.