Answer:
In the 1900’s, mass violence saw a dramatic increase, with major wars and genocides occurring in multiple countries. The two most significant patterns of mass violence during this time period were World War I and World War II, as well as the Armenian Genocide, Holocaust and the Great Purge of the Soviet Union.
World War I and World War II were the two major wars of the early 20th century, both spanning multiple countries and involving millions of troops. World War I saw the introduction of modern warfare, with new technologies such as machine guns and tanks, resulting in huge losses of life. World War II was even more destructive, with an estimated 60 million people killed.
The Armenian Genocide, Holocaust and Great Purge of the Soviet Union were three major genocides of the 1900’s. The Armenian Genocide, which took place in 1915-1923, saw the mass killing of over 1 million Armenians living in the Ottoman Empire. The Holocaust, which took place in Nazi Germany from 1939-1945, saw the mass killing of 6 million Jews. The Great Purge of the Soviet Union, which took place from 1936-1938, saw the mass killing of millions of Soviet citizens.