In the first 10 Amendments to the Constitution.
Answer:
The North European Plain
Explanation:
The North European plain is the most populated region of the four mentioned in the question.
This was not always the case, and until the Middle Ages, the North European Plain was sparsely populated. However, ever since, its population has been growing, because despite having a climate that is wet and cool the majority of the year, the soil is very fertile, and the lack of physical geographical barriers makes it easier for human dwelling.
The phenomenon that triangular trade most directly encouraged was slavery. The first part of the triangle was the crossing of the Atlantic Ocean by Europeans wishing to sell their products. With the money obtained the europeans would buy slaves; sometimes they would just trade the products they brought directly for slaves. The same european ships would then sail to America to sell the slaves as plantation labourers. With the money obtained the europeans bought raw products like cotton and took them to Europe for further processing. The complete cycle took like a year.
