Arthur Schlesinger Jr.'s Quote is Simply Inaccurate

"Bilingualism shuts doors. It nourishes self-ghettoization, and ghettoization nourishes racial antagonism. ... Using some language other than English dooms people to second-class citizenship in American society. ... Monolingual education opens doors to the larger world. ... institutionalized bilingualism remains another source of the fragmentation of America, another threat to the dream of 'one people'." (1991: 108-109)
Arthur Schlesinger Jr.

Adapted form Cummins, J. (2000), Language, power, and pedagogy: Bilingual children in the crossfire. Clevedon, England: Multilingual Matters.