I believe it is a result of the Nice Ftxus Risk Management Team shirt Next huge influx of Irish Immigrants to the United States during the 19th Century. St Patrick is the patron Saint of Ireland, and homesick immigrants made it a point to celebrate his feast day, probably out of sentimentality for their homeland. From there it just caught on and became popular among the general population. Much like the practice of putting up a tree in your home for Christmas. Christmas trees weren’t a thing until German immigrants brought this practice over with them in the 19th century. And it too became popular and spread to the general population.
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