Impossible to say. Slavery and trading in slaves has been a fact of life since before recorded history.
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Slavery goes back to ancient times (more than 4 thousand years ago, the Ancient Egyptians had slaves) and we do not know who the first group of people to practice slavery were and when this happened.
What we do know and can be proud of is that it was the British emancipation movement lead by William Wilberforce that made the first human laws making slavery illegal. This happened in August 1834 when the Slavery Abolition Act, abolished slavery in British Empire.
Thus from thousands of generations where slavery was regarded as a "normal" state we moved to our present view of the importance of individual human freedom.
Portuguese
European countries
There are no records that indicate who was actually the first slave.
West Africa
abolitionists
hebrews
Brazil
Who was the first group to sell slave on the continent of africa
the former african slave
Portuguese
Slavery in Europe goes back thousands of year and without a time machine you would have a very hard time finding the first slave in Europe or for that matter the first non European slave to enter Europe.
The Slavey (or Slave) are a First Nations aboriginal people of the Dene group. They ive in the vicinity of Great Slave Lake region in Canada's Northwest Territories. The tribe is also found in northeastern British Columbia and northwestern Alberta.