Some of them might be ahteist
The answer is Perspectives, they taught themselves about different perspectives to help them put depth into their artwork.
Answer:
ethnic, racial and cultural prejudice were escalating in German and Nazi controlled areas
Well first and the foremost this was one of the largest migrations in human history. The Bantu moved a lot across Africa and the contact with other cultures enriched their own and in response their culture influenced a lot of others. So the just the massive scale of the migration was what overwhelmed the other tribes.