Esther Howland, the woman who produced the first commercial American valentines in the 1840s, sold a then mind-boggling $5,000 in cards during her first year of business. The valentine industry in the United States has been booming ever since. Today, over 1 billion valentine cards are sent in this country each year -- second in number only to Christmas cards, according to the Greeting Card Association. (The happy day is also celebrated in Canada, Mexico, the United Kingdom, France and Australia.)
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