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The correct answer to this open question is the following.
What caused West Africans to transition from controlling the exchange of goods to European slave raiders was the fact that European powers such as Great Britain, Spain, or Portugal directly competed to acquire the control of the slave trade of African people.
Everything started with John Hawkins, considered to be the first European slave trader in 1562. Years later the government of Englan granted charters to merchants and traders to open locations in West Africa where they could exploit the raw materials and natural resources such as ivory and gold. Because of this, England started to get more competition from other European nations such as Switzerland, the Dutch, and Denmark.
Http://www.greatwar.co.uk/battles/
Europeans did not have the right to colonize other people. Although at the time they viewed themselves as the superiors of the world, colonizing other nations lead to many nations becoming similar to European countries and being forced to do labor rather than develop their own culture and system. Europeans could have achieved their goals of wealth and power without colonizing other people. This could've been achieved by creating alliances with nations they wished to colonize rather than completely taking them over. This would've lead to not only peaceful and larger relations but beneficial circumstances to both parties.
Hope this helps!
Its a bill that applies to the Indian tribes it gaurentees them the bill of rights