Prayers of thanks and special thanksgiving ceremonies are common among most religions after harvests and at other times. The Thanksgiving holiday’s history in North America is rooted in English traditions dating from the Protestant Reformation.
It also has aspects of a harvest festival, even though the harvest in New England occurs well before the late-November date on which the modern Thanksgiving holiday is celebrated.
In the English tradition, days of thanksgiving and special thanksgiving religious services became important during the English Reformation in the reign of Henry VIII.
Before 1536 there were 95 Church holidays, plus 52 Sundays, when people were required to attend church and forego work. Though the 1536 reforms in the Church of England reduced the number of holidays in the liturgical calendar to 27, the Puritan party in the Anglican Church wished to eliminate all Church holidays apart from the weekly Lord’s Day, including the evangelical feasts of Christmas and Easter (cf. Puritan Sabbatarianism).
The holidays were to be replaced by specially called Days of Fasting and Days of Thanksgiving, in response to events that the Puritans viewed as acts of special providence. Unexpected disasters or threats of judgement from on high called for Days of Fasting.
Información tomada de: Thanksgiving – Wikipedia