Long-term nationalist tensions and imperialistic rivalries in Europe contributed to the outbreak of World War 1. Germany had a strategic plan to defeat France first through a rapid attack, then focus on Russia with a two-front war. The assassination of Archduke Franz Ferdinand sparked a series of diplomatic failures, military mobilizations, and declarations that led countries into the war. New technologies like tanks, air power, chemical weapons, and submarines transformed the brutal trench warfare on the Western and Eastern Fronts, as all sides suffered millions of casualties over four years of conflict.

1. Causes of World War I

2. Long Range Causes

3. Nationalism French Revenge German Pride Pan Slavism Serbian Nationalism

7. Can of Worms

8. Alliances Defensive Allies Central Slavs

9. Conflicting Diplomatic Objectives

11. Militarism National Power Arms Race Social Darwinism

20. June 28 Assasination July 5 Blank Check July 23 Ultimatum July 28 War July 30 Aug 1 Russia Mobilizes Germany declares

23. Trench Warfare Battles Last Months Massive Scale Engineered Upside down castle Attrition

28. Big Bertha

29. Chemical Weapons

30. Flamethrower

31. The Tank

32. Air Power

33. U-Boats

34. The Western Front Battle of Verdun Battles of Somme 970,000 Casualties

35. The Western Front

36. The Eastern Front Gallipoli Russia 400,000 Casualties

37. The Middle East The Arab Revolt T.E. Lawrence 400,000 Casualties

38. The U.S. Enters Luisitania Zimmerman Telegram The Yank are Coming!

39. The Battle of the Argonne Forest

40. The Armistice

41. 65 million 8.5 million 37 million 57 percent 25 million

42. $337,980,579,560