" (4) The racial issue. Voucher plans were adopted for a time in a number of southern states to avoid integration. They were ruled unconstitutional. Discrimination under a voucher plan can be prevented at least as easily as in public schools by redeeming vouchers only from schools that do not discriminate. A more difficult problem has troubled some students of vouchers. That is the possibility that voluntary choice with vouchers might increase racial and class separation in schools and thus exacerbate racial conflict and foster an increasingly segregated and hierarchical society. We believe that the voucher plan would have precisely the opposite effect; it would moderate racial conflict and promote a society in which blacks and whites cooperate in joint objectives, while respecting each other's separate rights and interests. Much objection to forced integration reflects not racism but more or less well-founded fears about the physical safety of children and the quality of their schooling. Integration has been most successful when it has resulted from choice, not coercion. Nonpublic schools, parochial and other, have often been in the forefront of the move toward integration. "
― Milton Friedman , Free to Choose: A Personal Statement