The Canadians call that same day "Thanksgiving".

The USA celebrates "thanksgiving" on a different date, to commemorate the following:

In 1637, the Pequot tribe of Connecticut gathered for the annual Green Corn Dance ceremony. Mercenaries of the English and Dutch attacked and surrounded the village; burning down everything and shooting whomever try to escape. The next day, Newell notes, the Governor of Massachusetts Bay Colony declared: "A day of Thanksgiving, thanking God that they had eliminated over 700 men, women and children." It was signed into law that, "This day forth shall be a day of celebration and thanksgiving for subduing the Pequots."

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman

Columbus' letter, announcing the discovery of the New World

En conclusión, a fablar desto solamente que se ha fecho este viage que fué así de corrida, que pueden ver Sus Altezas que yo les daré oro cuanto hobieren menester (12), con muy poquita ayuda que sus altezas me darán: agora especería y algodon cuanto Sus Altezas mandaran cargar, y almastiga (13) cuanto mandaran cargar; é de la cual fasta hoy no se ha fallado salvo en Grecia y en la isla de Xio, y el Señorio la vendo como quiere, y lignaloe (14) cuanto mandaran cargar, y esclavos cuantos mandaran cargar, é serán de los idólatras; y creo haber fallado ruibarbo (15) y canela, e otras mil cosas de sustancia (16) fallaré, que habrán fallado la gente que allá dejo;

In conclusion, ... Hour Highnesses can see that I shall give you all the gold you may need, with very little help from Your Highnesses: as much of spices and cotton as Your Highnesses demmand; ... and as many slaves as you demand, taken from the idolaters...

Sorry, I'm not really up to translating 15th century Spanish... But the point is, Columbus' intention was quite clear from the outset.

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman

I would say millions. It is a shame that in Spanish Eduction we don't read the Very brief retelling of the destruction of the Indies (1552) by Fray Bartolomé de las Casas. I only know about this text from seeing it quoted in A People's History of the United States.

France is going down a slippery slope of historical revisionism with this Article 4.

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman