“The consequences are likely to be far-reaching and grave,” she predicted. The Supreme Court’s 6-3 decision Wednesday to permit states to redraw voting districts in such a manner as to decrease minority representation could well set the U.S. back to before the landmark Voting Rights Act of 1965. So warned Justice Elena Kagan in a dour dissent in Louisiana v. Callais, offering a long and dispiriting look at all the ways states circumvented the 15th Amendment from its ratification in 1870 until