How did Europeans justify the practice of African slavery?

Europeans sent collaborators and missionaries who were so.polite to the Africans. As a result, africans were so hospitable to these Europeans.

Europeans provided goods such as mirrors, clothes to the africans

it was the first amendment

monitor contract compliance and results of forestry activities to assure adherence to government regulations.  

plan and supervise forestry projects, such as determining the type, number and placement of trees to be planted, managing tree nurseries, thinning forest and monitoring growth of new seedlings.  

establish short- and long-term plans for management of forest lands and forest resources.  

determine methods of cutting and removing timber with minimum waste and environmental damage.  

supervise activities of other forestry workers.

by the way there is no video here.