Answer:
destruction or slaughter on a mass scale, especially caused by fire or nuclear war.
Explanation:
The Holocaust, also known as the Shoah, was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population.
Answer: Explanation I agree
The monarchy and the autocracy both have a head. The head is one of the powerful group. As they continue as leaders they would become a stronger group altogether. So basically one leader of the two groups that controls everything and is the most powerful one.