Thanksgiving Day is traditionally a day for families and friends to get together for a special meal. The meal often includes a turkey, stuffing, potatoes, cranberry sauce, gravy, pumpkin pie, and vegetables. Thanksgiving Day is a time for many people to give thanks for what they have.
The event that Americans commonly call the "First Thanksgiving" was celebrated by the Pilgrims after their first harvest in the New World in October 1621.  This feast lasted three days, and—as accounted by attendee Edward Winslow  —it was attended by 90 Native Americans and 53 Pilgrims.  The New England colonists were accustomed to regularly celebrating "thanksgivings"— days of prayer thanking God for blessings such as military victory or the end of a drought. 
Why do we celebrate Thanksgiving Day ( U.S. ) 2017? When was Thanksgiving first recognized as a national holiday? Here’s a brief history of this all-important American holiday.