What is the meaning of Thanksgiving? What is the reason Americans celebrate Thanksgiving? Thanksgiving is a holiday that is celebrated by many Americans and they do not even actually know the real reason why they celebrate Thanksgiving. Many Americans think Thanksgiving is celebrated because of a feast between the Pilgrims and the Native Americans, but that is not the truth. The truth may surprise you, the truth may be deeper than you have ever imagined the meaning and the reason for Thanksgiving in America to be celebrated.