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In page Booker T. Washington:

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Washington privately contributed substantial funds for legal challenges to segregation and disfranchisement, such as the case of Giles v. Harris, which was heard before the United States Supreme Court in 1903.[15] Even when such challenges were won at the Supreme Court, southern states quickly responded with new laws to accomplish the same ends, for instance, adding "grandfather clauses" that covered white people and not black people in order to prevent black people from voting.[citation needed]