In 1838, he drafted the "Appeal of Forty Thousand Citizens Threatened with Disfranchisement"', which urged the repeal of a new state constitutional amendment disfranchising free African Americans. There were widespread tensions and fears among whites following Nat Turner's slave rebellion of 1831 in Virginia. Although Pennsylvania was a free state that had abolished slavery, state legislators persisted in passing this amendment to restrict free blacks' political rights. They did not regain suffrage until after the ratification of the Fifteenth Amendment in 1870, following the Civil War.