As Father Jay Toborowsky and others have pointed out, the FIRST Thanksgiving was NOT in 1621 Plymouth with Protestant Pilgrims, rather, it was in 1565 Florida (St. Augustine) with Catholic Spaniards and Native Americans.
Squanto was the Native American man who mediated between the Puritan Pilgrims and the Native Americans. Squanto had been enslaved by Protestant English but he was freed by Catholic Spanish Franciscans. Squanto was baptzed and became a Catholic Christian. So it was a baptized Catholic Native American who orchestrated what became known as Thanksgiving even in 1621.
Fr. John's second half of his post reminds me of my family's holiday feast when I was a kid.