Expansion: Thanksgiving Day, a traditional western festival, is a festival created by the American people and also a festival for American reunion. At first, there was no fixed date for Thanksgiving Day, which was decided temporarily by American states. It was not until 1863 after the independence of the United States that President Lincoln declared Thanksgiving a national holiday. 194 1 year, the US Congress officially designated the fourth Thursday in June 1 1 as "Thanksgiving Day". Thanksgiving holiday usually lasts from Thursday to Sunday.