Like many Americans, I didn’t fly to a family gathering at Thanksgiving this year – the first time I’d missed it in decades.That got me thinking about the origins of the holiday — beyond the set piece of Mayflower pilgrims and Indians, and beyond the annual turkey gorge fest and Black Friday sales.Rereading a little history I learned that it wasn’t until 1863, in the midst of the Civil War, that President Abraham Lincoln proclaimed a national Thanksgiving Day to be held each November. In his proclamation Lincoln urged all Americans to ask God to “heal the wounds of the nation.”I thought of Lin…