Describe glonal trade before the 1990?

What would lead a historian to consider two events to have a relationship of correlation rather than causation

During the early neolithic era, people relied on domesticated animals to provide each of the following except a. hides for clothes b. labor to pull plows c. manure for the soil d. meat, cheese, and milk for food

1. what was the result of growing nationalism and pan-africanism on european-african relations? africans were encouraged to seek independence from europe. european colonialism grew and strengthened in africa. the change of power from european to african rule went smoothly. africans believed they could live peacefully with europeans.