Why did World War I happen? Who was at war? Click on the link below and it will take you to a virtual map that will give you a quick two-minute overview of World War I.

This activity might not be viewable on your mobile device.Video segment. Assistance may be required. Series : World War I, 1914-1918

After looking at the virtual map, respond to the questions below. Feel free to replay the animation in the map if that helps.

Interactive exercise. Assistance may be required.