1620年欧洲殖民者到达普利茅斯洛克,第二年即1621年他们获得大丰收.感恩节就是为纪念这一丰收而举行的庆祝活动。In 1621, a year after the European colonists arrived in 普利茅斯洛克 in 1620, they had a great harvest, for which thanksgiving was celebrated.