Thanksgiving Day is a national holiday celebrated on various dates in the United States, Canada, some of the Caribbean islands, and Liberia. It began as a day of giving thanks and sacrifice for the blessing of the harvest and of the preceding year. Similarly named festival holidays occur in Germany and Japan.
Thanksgiving, which occurs on the fourth Thursday in November, is based on the colonial Pilgrims' 1621 harvest meal. The holiday continues to be a day for Americans to gather for a day of feasting, football and family.
More information on Thanksgiving can be viewed https://www.history.com/topics/thanksgiving/first-thanksgiving-meal