Thanksgiving is a national holiday in the United States, celebrated on the fourth Thursday of November. It originated as a harvest festival. Thanksgiving has been celebrated nationally on and off since 1789, with a proclamation by George Washington after a request by Congress. Thomas Jefferson chose not to observe the holiday, and its celebration was intermittent until the presidency of Abraham Lincoln, when Thanksgiving became a federal holiday in 1863, during the American Civil War. Lincoln proclaimed a national day of “Thanksgiving and Praise to our beneficent Father who dwelleth in the Heavens,” to be celebrated on the last Thursday in November. Under President Franklin D. Roosevelt, the date was changed between 1939 and 1941 amid significant controversy. From 1942 onwards, Thanksgiving has been proclaimed by Congress as being on the fourth Thursday in November. Thanksgiving is regarded as being the beginning of the fall–winter holiday season, along with Christmas and the New Year, in American culture.