I disagree. America has been and should continue to be a diverse melting pot, accepting peoples and ideals from all corners of the globe. We shouldn't try to weed out people based on something like intelligence or a vague notion of "cultural fit," as though some people should be held to a higher standard to live in this country based purely on an accident of birth. We should accept immigrants based on capacity. I know it sounds quaint and hokey, but I really believe in the words engraved at the foot of the statue of liberty:

    Give me your tired, your poor,
    Your huddled masses yearning to breathe free,
    The wretched refuse of your teeming shore.
    Send these, the homeless, tempest-tost to me,
    I lift my lamp beside the golden door!