4. World War I Left Photo: Word War I Trench Courtesy of Mrs J Smillie Right: WW I Postcard of soldiers taking cover in shell holes Courtesy Queen’s University Archives

7. Gavrilo Princip

8. Gavrilo Princip was a member of a Serbian terrorist organization known as “The Black Hand”. Many Serbs wanted to bring Bosnia under Serb control. Princip’s assassination of Archduke Franz Ferdinand triggered World War I. World War I and the ensuing Treaty of Versailles would create the conditions leading to World War II. World War II would in turn create the conditions leading to the Cold War. Would the world be a different place today if Princip had not carried out his assassination of the Archduke? Millions of people have died as a result of the 20 th century events that followed Princip’s assassination of the Archduke. At very minimum, he triggered World War I. Many would argue that confrontation between the world’s great powers was inevitable. Yet, the Cold War did not lead to global warfare.

20. The Domino Effect

27. The Domino Effect

28. August 1914

30. September 1914

33. Changing Technology

39. Chemical Warfare The horror and disgust at the wartime use of poison gases was so great that its use was outlawed in 1925 - a ban that, at least in theory, is still in force today. Photos: Courtesy Unites States Air Force Air War College Table Source: First World War.com

40. Isolation

46. President Wilson declares war and enters WWI

48. In this cartoon, a British soldier laden with his heavy kit and weapons offers to help a lady with her shopping bags. The cartoon, like many others like it, glorifies the self sacrifice and gentility of the Allied troops, in contrast to the rapacious German soldiers. This cartoon appeared in Punch.

50. In this cartoon the German Kaiser is seen mocking the Belgian King, telling him that he has lost everything. The Belgian replies that he has not lost his soul.

51. German Kaiser is seen mocking the Belgian King, telling him that he has lost everything. The Belgian replies that he has not lost his soul. The cartoon refers to the fact that neutral Belgium has been invaded and largely overrun by the Germans as they sought to outflank the French and British armies by pushing along the English Channel towards Paris. The Belgians were vastly outnumbered but fought bravely against the Germans.

53. President Wilson declares war and enters WWI