1 Unit Four World War I World War II

2 Russian Revolution  Czar Nicolas has his power removed and the Communist party takes over the Soviet Union

3 Treaty of Versailles  This treaty ends World War I  Punishes Germany for acts during World War I

4 Depression  Economic  Sustained, long-term downturn in economic activity

5 Nazism  The political party led by Adolf Hitler

6 Holocaust  The removal and killing of over 6 million Jews during World War II

7 Cold War  A verbal and economic war between the United States and the Soviet Union

8 Superpowers  A country with a dominant position in the international system of countries

9 Soviet Union  A country that existed in eastern Europe between 1922 and 1991

10 Collapse  to break down; come to nothing; fail

11 Reunification  to make or become a single unit again; unite