Millions of American families honor their mothers every year with cards, flowers, special meals and other gifts on the second Sunday in May thanks to the work of Anna Jarvis, the founder of this country’s Mother’s Day. A single woman without children, Jarvis relentlessly lobbied for the holiday in honor of her own mother’s death, which took place on the second Sunday of May 1905. By 1914, the celebration had become so popular that it was declared a national holiday (Jarvis later regretted lobbying for the official holiday after it became commercialized.)