What was the duration of the Second World War?

1. 1914-1918
2. 1939-1945
3. 1937-1945
4. 1930-1945

Why did USA join the Second World War?

1. USA was against Hitler
2. Japanese invasion of Pearl Harbour
3. USA was against dictatorship
4. USA wanted to halt advances of Axis Powers

How was the rise of Nazism in Germany responsible for the Second World War?

How did the rise of Fascism in Italy lead to the Second World War?