Key document“Our harvest being gotten in, our Governor sent four men on fowling, that so we might after a more special manner rejoice together, after we had gathered the fruits of our labours. [...] many of the Indians coming amongst us, and amongst the rest their greatest king, Massasoit, with some ninety men, whom for three days we entertained and feasted.” Edward Winslow, letter of 11 December 1621.
Read the source: Pilgrim Hall Museum, the First Thanksgiving · NMAI, Harvest Ceremony study guide · Lincoln's proclamation, 1863
"set apart and observe the last Thursday of November next, as a day of Thanksgiving and Praise"
Abraham Lincoln, proclamation of 3 October 1863
Another viewpointThe Pilgrim Hall Museum describes the 1621 gathering as a diplomatic event: the English needed to keep the alliance made a few months earlier with the Wampanoag sachem Ousamequin, the Massasoit. Winslow's account says the Wampanoag brought five deer. In 1863, in the middle of the Civil War, Lincoln proclaimed a national day of Thanksgiving. In 1941, Congress fixed it on the fourth Thursday of November.