New Year's Day is celebrated on January 1st and marks the beginning of the new year on both the Gregorian and Julian calendars. Valentine's Day on February 14th originated as a celebration of fertility in ancient Rome. St. Patrick's Day on March 17th commemorates the death of St. Patrick and is celebrated with religious services and festivities. Earth Day on March 20th/21st or April 22nd aims to increase environmental awareness. Memorial Day in May honors Americans who died serving in the military. The Declaration of Independence was signed on July 4th, 1776, setting the 13 colonies on the path to independence. Thanksgiving in November originated from a 1621 harvest feast shared by the Plymouth colonists and Wamp