In the 20th century there were two ‘world wars’. Many countries were affected by the wars. The first war lasted from 1914 to 1918. Though it was fought mostly in Europe, people called it the First World War (World War 1).
The Second World War (World War 2) lasted from 1939 to 1945. It was fought in Europe, in Russia, North Africa and in Asia. 60 million people died in World War 2. About 40 million were civilians. Children as well as adults were affected by the war.Visit BBC World War II Website