Here's a pretty good overview of the history of Thanksgiving in America:
https://www.almanac.com/thanksgiving-day
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Just one point from the perspective of a New England born yankee and descendant of the original settlers (not a brag): the Pilgrims and Puritans are lumped in together in much of what you might read. The Pilgrims of Plymouth Rock were separatists, wanted to have their own church, separate from the Anglican church, but the Puritans wanted to purify the church. Their attitudes were different, and it was the intolerance of some of the Puritans that led to the witch trials at Salem. The Pilgrims created a document, the Mayflower Compact, which is the forerunner of the US Constitution.
Tax, showing separation
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