USS Constitution crew member Seaman Josh Hanover carries the national ensign during Plymouth's annual Thanksgiving Day Parade. Plymouth was founded in 1620 by English separatist Pilgrims, who are credited with hosting a feast of Thanksgiving a year later. At 211 years old, USS Constitution is the oldest commissioned warship afloat in the world, manned by 68 active duty U.S. Navy sailors, and visited by nearly half a million tourists annually.