Today is Thanksgiving. Yesterday, President Biden issued the formal Proclamation (full text) declaring today as a National Day of Thanksgiving. The Proclamation reads in part:
This Thanksgiving — the last one I will declare as President — I express my gratitude to the American people. Serving as President has been the honor of a lifetime. America is the greatest country on Earth, and there is so much to be grateful for. May we celebrate all that unites us — because there is nothing beyond our capacity if we do it together.
... I encourage the people of the United States of America to join together and give thanks for the friends, neighbors, family members, and communities who have supported each other over the past year in a reflection of goodwill and unity.
The National Archives website displays the 1941 Congressional Joint Resolution that finally fixed the fourth Thursday in November as the date for Thanksgiving Day, along with some interesting history surrounding the selection of the date.