The tsars were Russian Orthodox
A. The Holocaust
German Nazis felt that Jews and any one else who was not part of the master race of Aryans (blonde hair, blue eyes) were inferior so they were sent to death camps called Concentration Camps and were systematically killed.
A. To make them feel blame for what happened
Vietnam War is definitely one I'm not sure about the other two though
1.discovery of iron
2.the use of iron weapons
