A lauded writer who brought to light stories overshadowed by prejudice. An actress and singer who helped embody the manufactured innocence of the 1950s. A self-made billionaire who rose from a childhood of Depression-era poverty and twice ran for president.

This year saw the deaths of people who shifted culture through prose, pragmatism and persistence. It also witnessed tragedy, in talent struck down in its prime.

In 2019, the political world lost a giant in U.S. Rep. Elijah E. Cummings. He was born the son of a sharecropper, became a lawyer, then an influential congressman and champion of ci...