When did World War I begin?

Which event started World War I?

When did World War II begin?

Which two cities were bombed with atomic bombs in World War II?

Which countries formed the Axis Powers in World War II?

What was the global organization formed after World War II to promote peace?

Which war ended with the signing of the Treaty of Versailles?

Which country emerged as a superpower after World War II?

One major impact of World Wars was:

What was the name of the German Air Force during World War II?