Lord Voldemort had ALL of his Horcruxes in tact (he WORE the Gaunt family Ring, Salazar Slytherin’s locket, and the Lost Diadem of Rowena Ravenclaw) and ended Harry Potter for good during the Final Battle of Hogwarts, conquered the entire Wizarding world, mastered the Elder Wand, and became permanent Minister for Magic.
Voldemort’s daughter Delphini was made permanent Head of the Department of Magical Law Enforcement, with Bellatrix Lestrange as the Deputy Head.
2nd Darkest wizard of all time Gellert Grindelwald—NOT murdered by Voldemort, was appointed permanent Headmaster of Hogwarts, with Dolores Umbridge as the Deputy Headmistress (Minerva McGonagall was also defeated during the Second Wizarding War).