- The number of countries involved: World War 2 involved over 100 countries, while World War 1 involved around 30.
- The geographic scope of the war: World War 2 was fought on every continent except Antarctica, while World War 1 was primarily fought in Europe.
- The number of people killed: World War 2 resulted in the deaths of an estimated 70-85 million people, while World War 1 resulted in the deaths of an estimated 17 million people.
- The impact of the war on the global economy and society: World War 2 had a profound impact on the global economy and society, leading to the creation of the United Nations and the Cold War, while World War 1 did not have as significant an impact.
Overall, World War 2 was a more global and destructive conflict than World War 1, and thus can be considered more of a world war.