The King said:
[The post-Christian racial slavery was not an American "speciality" as the Europe created this racial slavery in the name of superior education and religion. I think the first to suffer were the native American in the hands of Spanish conquistadors (Christoph Collomb was such a slaver). France, Portugal and England also had their responsability (in Asia, Africa and the Middle-East). If I remember well the first African slaves in the US were sold to the settlers by the British (but I may be mistaken).
I didn't mean that racially-justified slavery was unique to the USA (though the antebellum USA probably codified & formalised it more than anywhere else) but that it developed primarily in the Americas, north south & central, as a way to continue to justify slavery despite its being regarded as un-Christian and (perhaps more importantly) against the values of the 17th/18th-century Enlightenment - BTW enslavement of whites in the American colonies wasn't outlawed until the early 18th century AIR, though ownership of whites by blacks had been outlawed a couple of decades earlier. Religiously-justified slavery in the Muslim world is a similar phenomena; the need to separate out 'other' groups who it's ok to enslave.
Slavery had died out in England after the Norman conquest, as Saxon slaves became serfs (along w plenty of free Saxons) and it became economically unnecessary, but persisted in the Celtic fringe of Ireland & Scotland into the 16th century, especially in the Scots borders where raiding was often a way of life. The development of the English Caribbean colonies in the 16th century brought a new economic need for slavery for England - initially English whites, mostly 'criminals' (who could just be unfortunate debtors) were used, but they died too quickly in the Caribbean climate, so longer-lived African slaves were used increasingly. Then with the Enlightenment & development of 'universal rights of man' ideas, it became harder to justify slavery, hence the emergence of the racial model where it was ok to eg enslave Africans but not Europeans.