Answer:
The correct answers are:
1. U.S. Presidents designated Thanksgiving as an annual holiday
3. U.S. Presidents determined when Thanksgiving should be celebrated.
Explanation:
George Washington (1732 - 1799), the first president of the United States have introduced the Thanksgiving day on November 26, 1789, with his proclamation.
Abraham Lincoln (1809 - 1865) proclaimed Thanksgiving to be a national holiday in 1863.
In 1870 Ulysses S. Grant turned Thanksgiving into a federal holiday in the Washington D.C. area.
Ultimately, with the law issued by Congress in 1942, Thanksgiving was determined to be celebrated every fourth Thursday of November. Prior it was appointed by the discretion of the President.
