Final answer:
Susan Lucci won an Emmy Award on May 21, 1999, after being nominated for 19 consecutive years, for her role as Erica Kane on 'All My Children'.
Step-by-step explanation:
On May 21, 1999, the 'All My Children' actor who finally won an Emmy Award on her 19th consecutive nomination was Susan Lucci. Known for her role as Erica Kane, Susan Lucci had become almost as famous for not winning the award as she was for her acting. After being nominated every year since 1978, Lucci's victory was a highly celebrated moment not only for her but also for devoted fans of the show.