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Answer:
Well basically european countries took people from africa and brought them to their own countries and the americas, so that was the root of it. And that may have sparked racism, where whites thought they were better than people with darker skin.
Answer:
This question is very vague but I think how it started was that europeans took people from africa and the carribean and stuff to be slaves in some of the colonies and in their own countries. The slaves had different skin color too so I think thats how it became race based