THANKSGIVING IN AMERICAN MEMORY (彭蒙慧英語) 11/22

Today I read THANKSGIVING IN AMERICAN MEMORY (彭蒙慧英語) on 11/22. It is about how Thanksgiving become an official holiday. At the beginning, the first American president, George Washionton proclaimed November 26th to be a day of national thanksgiving and prayer in 1789 with the Congressional requst. However, Thanksgiving didn't become an annual tradition at this time. During the American Civil War, President Abraham Lincoln proclaimed the last Thursday in Novomber to be Thanksging Day. After the war, Thanksgiving finally become a national holiday, which continues to this day. After reading the article, I finally understand how Thanksgiving become a national holiday because in the past I could only read the introduction of customs of Thanksgiving. Here is its website:http://www.studioclassroom.com.tw/ad/ad_article.php?article_id=11a08&volume=2007-11-01&zoot=08