sentences:  Legal historian Paul Finkelman argues that Union victory in the Civil War and the Reconstruction Amendments, which were ratified after Lincoln's death but were made possible by the Civil War, changed the nature of the Constitution.The Union victory and the subsequent Supreme Court case of "Texas v. White" ended debate regarding the constitutionality of secession and Nullification by the states.In addition to ending slavery, the Reconstruction Amendments enshrined Constitutional clauses promoting racial equality.