National holiday in the United States commemorating the Pilgrims‘ celebration of the harvest reaped by the Plymouth Colony in 1621, after a winter of great starvation and privation. The celebration was probably held in October. The neighboring Wampanoags, who outnumbered the colonists, joined them for three days and contributed food to the celebration. The first proclaimed day of thanksgiving in the colony was not held until 1623 (probably at the end of July), following an improvement in prospects for the still struggling colony, and was a day of prayer, not feasting. Read more..