This document provides background information about Thanksgiving in the United States. It discusses the origins of Thanksgiving among the Pilgrims and Wampanoag people in 1621, though the holiday was not officially recognized as a national celebration until 1863. The document also acknowledges the difficult history and marginalization faced by Native American peoples, including the forced relocation of many tribes in the 1830s-1850s. It provides timelines of key Thanksgiving-related events and details about modern Thanksgiving traditions like turkey, parades, shopping, and family meals.