Answer:
The term "Hessians" refers to the approximately 30,000 German troops hired by the British to help fight during the American Revolution. They were principally drawn from the German state of Hesse-Cassel, although soldiers from other German states also saw action in America. (At the time, Germany was not a unified country but a collection of individual states that shared a language and culture.)
Here are three effects of slavery in Africa:
communities devastated by the loss of men, women, and children to the slave trade
economic exploitation of the people
colonization of almost the entire African continent