Causes of the Second World War Share/Embed

Historical causation is key to understanding how the past has unfolded. Read more in our causation one-pager.  

Did you know? Pablo Picasso’s Guernica is MASSIVE. It’s 11 feet, 5 inches tall and 25 feet, 6 inches wide. It’s about the size of a small school bus. So, your students might see it in miniature, as it’s provided in the activity, and miss the way the figures—the screaming horse, wailing mother, broken bodies and buildings—loom over the viewer when seen in person. Picasso made the horrors of war too big to ignore. Today, the painting is held in the Museo Reina Sofía in Madrid, Spain. When the painting was transferred there, its size and fragility meant it needed to be transported by a special vehicle, in a custom crate, using a crane designed to install the painting in its new home. For a visual and oral history of Guernica, see the museum’s “Rethinking Guernica.” Don’t miss the Gigapixel tool, which will let your students zoom in and see the painting in x-ray and ultraviolet.

OER Project offers several maps to help you teach the global scale of the Second World War. In addition to using our alliances and casualties map, try having students compare these two maps of the Pacific theater: Imperial Powers in 1939 and The War in the Pacific. Ask students how the two maps are related—how did imperial ambitions help spark conflict? What do these two maps tell us about the goals of the Japanese Empire?

The causes of the Second World War are many and complex. Be sure to read the Lesson Guide for sample answers that will help you guide students through this causation activity and its causal map.  

This video and the related geography activity include several maps made during this period. Some of the most detailed and engaging maps from this period were made by Canadian cartographer Stanley Turner. You can find several more of his maps related to World War II and later at the David Rumsey Map Collection. This post-war 1945 map could be particularly useful as you prepare students to learn about the Cold War. You might ask students to zoom in on the narrative text and try to find two or three events that might have created discord among the Allies.

Did you know: American spies tried inventing a fart weapon. In 1944, Ernest Crocker was working at the Office of Strategic Services (the predecessor to the CIA). He created a spray called “Who, Me?”, which had a powerful “fecal odor.” The idea was that French resistance fighters could discreetly apply the spray to Nazi officers, humiliating them and undermining German morale. Unfortunately, America’s spies forgot that “whoever smelt it, dealt it.” The spray was difficult to control. More often than not, it ended up contaminating the user. Despite the weapon’s failure, Crocker’s experiments led him to other breakthroughs in sensory and food technology after the war.

Causal thinking is a core skill in history. Read more in the blog post “Helping Students Make Sense of the Past, Present, and Future.”