An Excellent History of Thanksgiving...

by Pastor Mark Roberts. It's outstanding! A sample:

The idea of a permanent, national celebration each November came 242 years after the first Pilgrim-Indian festival in the early 17th century. During the Civil War, many Americans clamored for some sort of national religious holiday. One of the most vocal was Sarah Josepha Hale (who, by the way, wrote “Mary Had a Little Lamb”). Hale used her clout as editor of the influential Godey’s Lady’s Book magazine to motivate President Lincoln to proclaim a national holiday. On September 28, 1863 she wrote a letter to the President encouraging him to “have the day of our annual Thanksgiving made a national and fixed Union Festival.” Five days later Lincoln issued the “Thanksgiving Proclamation of 1863” (which we’ll examine below).

In his proclamation, Lincoln set apart the “last Thursday of November” as “a day of thanksgiving and praise to our beneficent Father who dwelleth in the heavens.”

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