it is 2
before the Paleolithic ages
There has always been slavery inside Africa.
(Sadly slavery is still in Africa today.)
Europeans sold goods that the kingdoms wanted.
The kingdoms kept pushing further and further into the interior.
This created a continuous cycle.
Whites were sold into slavery in Africa also.
(They were captured from barbery pirates in North Africa.)
The third reich based its power primarily on intimidation and fear, especially when it came to persecuting the Jews. This was true since the beginning.
The primary drizzling affair was the attack of Poland by Nazi Germany on September 1, 1939, and the following words of war on Germany. Made by Britain and France, but many further previous events have been suggested as leading reasons.