Answer:
Explanation:
Europeans use slaves because they want to expand their empires, and for that Europeans started to slave the African continent, they had better technology and weapons, submitting an African continent almost without technology was easy, Europeans started to use slaves in their countries, colonies, even they're selling slaves to North America.
One way is that medieval Europe had knights to protect people and followed the code of chivalry and medieval Japan had samurai
Free land (well they had to pay like 10 cents), and gold (the gold rush).
