Thanksgiving is a national holiday celebrated on various dates in the United States, Canada, Grenada, Saint Lucia, and Liberia. It began as a day of giving thanks and sacrifice for the blessing of the harvest and of the preceding year. Similarly named festival holidays occur in Germany and Japan. Thanksgiving is celebrated on the second Monday of October in Canada and on the fourth Thursday of November in the United States and around the same part of the year in other places. Although Thanksgiving has historical roots in religious and cultural traditions, it has long been celebrated as a secular holiday as well.
In the United States… Thanksgiving 2022 occurs on Thursday, November 24th.
Pilgrims and Puritans who emigrated from England in the 1620s and 1630s carried the tradition of Days of Fasting and Days of Thanksgiving with them to New England. The modern Thanksgiving holiday tradition is traced to a well-recorded 1619 event in Virginia and a sparsely documented 1621 celebration at Plymouth in present-day Massachusetts. The 1619 arrival of 38 English settlers at Berkeley Hundred in Charles City County, Virginia, concluded with a religious celebration as dictated by the group’s charter from the London Company, which required “that the day of our ships arrival at the place assigned … in the land of Virginia shall be yearly and perpetually kept holy as a day of thanksgiving to Almighty God.” The 1621 Plymouth feast and thanksgiving was prompted by a good harvest. The Pilgrims celebrated this with the Wampanoags, a tribe of Native Americans who, along with the last surviving Patuxet, had helped them get through the previous winter by giving them food in that time of scarcity, in exchange for an alliance and protection against the rival Narragansett tribe.
In 1621, the Plymouth colonists and the Wampanoag shared an autumn harvest feast that is acknowledged today as one of the first Thanksgiving celebrations in the colonies. For more than two centuries, days of thanksgiving were celebrated by individual colonies and states.
Earlier, Thanksgiving in the United States has been observed on differing dates. From the time of the Founding Fathers until the time of Lincoln, the date of observance varied from state to state. The final Thursday in November had become the customary date in most U.S. states by the beginning of the 19th century, coinciding with, and eventually superseding the holiday of Evacuation Day (commemorating the day the British exited the United States after the Revolutionary War).
Modern Thanksgiving was proclaimed for all states in 1863 by Abraham Lincoln. Influenced by Sarah Josepha Hale, who wrote letters to politicians for approximately 40 years advocating an official holiday, Lincoln set a national Thanksgiving day by proclamation for the final Thursday in November, explicitly in celebration of the bounties that had continued to fall on the Union and for the military successes in the war, and also explicitly in “humble penitence for our national perverseness and disobedience. Because of the ongoing Civil War, a nationwide Thanksgiving celebration was not realized until Reconstruction was completed in the 1870s.
On October 31, 1939, President Franklin D. Roosevelt signed a presidential proclamation changing the holiday to the next to last Thursday in November, for business reasons. On December 26, 1941, he signed a joint resolution of Congress changing the national Thanksgiving Day to the fourth Thursday in November.
Traditionally, Thanksgiving has been a celebration of the blessings of the year, including the harvest. On Thanksgiving Day, it is common for Americans to share a family meal, attend church services, and view special sporting events. In addition, Thanksgiving is celebrated in public places with parades such as Macy’s Thanksgiving Parade in New York City, ABC Dunkin’ Donuts Thanksgiving Day Parade] in Philadelphia, America’s Hometown Thanksgiving Parade in Plymouth, Massachusetts, McDonald’s Thanksgiving Parade in Chicago, and Bayou Classic Thanksgiving Parade] in New Orleans. What Americans call the “Holiday Season” generally begins with Thanksgiving. The first day after Thanksgiving Day—Black Friday—marks the start of the Christmas shopping season.
Information obtained from Wikipedia.com and https://www.history.com/news/thanksgiving-history-trivia-facts