What is Thanksgiving Day ? What does the Thanksgiving holiday celebrate for ?Thanksgiving is a national holiday celebrated annually in the United States on the fourth Thursday in November. It's a tradition on this day to invite friends and family to your house for a large Thanksgiving feast.Numerous nations celebrate a Thanksgiving holiday. Many Americans consider Thanksgiving to be the quintessentially American holiday.Learn about the first encounter between the Pilgrims and Native Americans in 1621, their surprising relationship, and the reason a United States president created a holiday in honor of it.Thanksgiving is a national holiday celebrated annually in the United States on the fourth Thursday in November. It's a tradition on this day to invite friends and family to your house for a large Thanksgiving feast.Numerous nations celebrate a Thanksgiving holiday. Many Americans consider Thanksgiving to be the quintessentially American holiday.Learn about the first encounter between the Pilgrims and Native Americans in 1621, their surprising relationship, and the reason a United States president created a holiday in honor of it.