High Quality Content by WIKIPEDIA articles! Thanksgiving Day is a harvest festival celebrating primarily in the United States and Canada. Traditionally, Thanksgiving is associated with giving thanks to God for the harvest and expressing gratitude. While historically religious in origin, Thanksgiving is now primarily identified as a secular holiday. The date and location of the first Thanksgiving celebration is a topic of modest contention. The traditional "first Thanksgiving" is the celebration that occurred at the site of Plymouth Plantation, in 1621. According to tradition, the Pilgrims hosted a delegation of about 90 Wampanoag led by a chieftain Massasoit. The Wampanoag are but one of a multitude of distinctive nations that at that time were already living in areas subjected to colonization that eventually became the northeastern United States and southeastern Canada.