St. Valentine's Day is not an American invention. It originated as a Christian festival. Since the 1800s, many nations have seen the tradition of exchanging lettters, cards or gifts spread into the modern commercialized version we observe today.
Valentines day wasn't invented actually it was a person. He was a person who gave love to the world and this is the day we celebrate it.
the St. valentines day massacre happened on February 14, 1929
St valentines
It was on a Thursday.
St Valentines day
Saint Valentine's Day 1929
Al Capone orchestrated the St. Valentine's Day Massacre
February
14th Febuary 1929 §♥
1929
They celebrate St Valentines day because on that day St Valentine was beheaded for Marrying christian couples in a pagan kingdom.
Al Capone was the most likely suspect.