Who were mainly used as slaves before the Europeans started selling African slaves

the Portuguese

Explanation:

the Portuguese in the 16th century were the first to engage in the Atlantic slave trade in 1526 they completed the first Transatlantic slave voyage to Brazil and other Europeans soon followed

the old way of life was represented by superstition, an angry god, and absolute submission to authority. the thinkers of the age of reason ushered in a new way of thinking. this new way championed the accomplishments of humankind. individuals did not have to accept despair. science and reason could bring happiness and progress. kings did not rule by divine right. they had an obligation to their subjects. europeans pondered the implications for nearly a century. americans put them into practice first.