Final answer:
Susan Lucci won her first Emmy Award on May 21, 1999, after 19 consecutive nominations for her role on 'All My Children'.
Step-by-step explanation:
On May 21, 1999, Susan Lucci won an Emmy Award for her role as Erica Kane on the soap opera 'All My Children'. This victory was particularly remarkable as it came after 18 previous nominations. Lucci received her first nomination in 1978 and, after two decades, she finally received the recognition she had long deserved from her peers in the television industry with this win.