Comment: The Kings and Queens of those countries (Italy, Spain, Portugal)

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In reply to comment: I'm sorry but you're plain wrong. (see in situ)

The Kings and Queens of those countries (Italy, Spain, Portugal)

were all "heads" of the Catholic Church -- or Guardians, if you will.

Slavery was condoned by Catholic Popes during the whole period of American slavery.

And in US (America) slavery was condoned by nearly all forms of non-Catholic Christianity save Quakers, who were a minority among Protestants.

If you do not believe those countries or America was founded on Christianity then you are in the minority view -- even among Daily Paulers who argue that America was founded on Judeo-Christian "principles" -- as has been argued many times over.

I'm not giving "my view" here -- just playing devils advocate, giving you and/or others to chime in/on.