Older tradition
The sending of Valentines was a fashion in nineteenth-century Great Britain, and, in 1847, Esther Howland developed a successful business in her Worcester, Massachusetts home with hand-made Valentine cards based on British models. The popularity of Valentine cards in 19th century America, where many Valentine cards are now general greeting cards rather than declarations of love, was a harbinger of the future commercialization of holidays in the United States.[5] It's considered one of the Hallmark holidays.