Answer:
a. internal conflict among native African groups was intensified.
Explanation:
European expansion into Africa, from the activities of the explorers, through the era of slave trade until the period of colonial occupation intensified conflict among native Africans.
This internal conflict was more pronounced during the slave trade when African rulers will need to war against neighbouring villages in order to capture them as slaves to be sold to the European traders in exchange for foreign commodities.
It only appeared to be so. The roaring twenties was soon followed by the Great Depression, I believe, and lots of people suffered during that time.
A) historian
An archaeologist may find it but a historian would study it
Europeans domesticated cattle, pigs, chicken, goats, and sheep to the Americas.
https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/exchange-plant-and-animal-species-between-new-world-and-old-world#:~:text=Europeans%20introduced%20such%20domestic%20animals,hides%20or%20wool%20for%20clothing.
