A second similar “Thanksgiving” celebration occurred on American soil on April 30, 1598 in Texas when Don Juan de Oñate declared a day of Thanksgiving to be commemorated by the Holy Sacrifice of the Mass.
The Catholic origins of Thanksgiving don’t stop there. Squanto, the beloved hero of Thanksgiving, was the Native American man who mediated between the Puritan Pilgrims and the Native Americans. Squanto had been enslaved by the English but he was freed by Spanish Franciscans. Squanto thus received baptism and became a Catholic. So it was a baptized Catholic Native American who orchestrated what became known as Thanksgiving.
And, of course, let’s not forget (as the essay points out) that the word “Eucharist” means “Thanksgiving.”