person refused to sign the Pennsylvania constitutional conversion document because it had a provision limiting suffrage to only whites and later became a leader in the drive for equal rights for African-Americans after the Civil War.

Thaddeus Stevens

Explanation:

Thaddeus Stevens represented Pennsylvania in the US house of representatives. He was one of the members of Republican party and was against racial discrimination in elections.

In 1837, he refused to sign Pennsylvania constitutional conversion document owing to the inclusion of a voting provision that denied African - Americans voting rights. He stood by abolition of slavery and was against racial discrimination in grating American citizenship.

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