St. Patrick's Day is the holiday that celebrates the death of St. Patrick, the patron Saint of Ireland. He was credited with bringing Christianity to his people and explained the Holy Trinity (Father, Son, and Holy Spirit) using three leaves of the native Irish clover. Since the 10th century, people in Ireland have been celebrating the Roman Catholic feast on March17th, but the first St. Patrick's Day was celebrated in America.
After this first celebration, the Irish soldiers homesick marched to New York to honor the patron saint. The celebration only grew from there. This holiday has a lot of history and impact not only on Americans, but especially Irish-Americans. The celebration continues to grow the economy and the love of the holiday.