The aryans were groups of nomads who were originally from

central Asia

Explanation:

Aryans are an ethnic group related to Indo-Europeans, originating in Central Asia and spreading throughout Europe during the Neolithic period. The term "Aryan" also refers in the history of languages to Proto-Aryan, which would have been the common linguistic branch to the ancestors of the Indo-Aryan and Iranian peoples and to the two great linguistic subrams it gave rise to, or namely the Indo-Arctic languages and the Iranian languages. These two sub-branches are Aric or Indo-Iranian. It may also refer specifically to the language groups now known as Proto-Indo-European, Proto-Indo-Iranian and Indo-Iranian. At one time, the term was also used to denote all Indo-European languages.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

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