The territory was close to their lands in North America
The transatlantic slave trade began in the 15th century<span>, after the Portuguese started exploring the coast of West Africa.</span>
Fertile land and things of that nature
To draw a map of the round earth on a flat surface, Cartographers use map projections. There are several ways it can be done, but every type of projection distorts reality in some way. Scientists use a Tissot's indicatrix to quantify distortions that are introduced when creating a map
I hope I helped ^.^