World War I World War I

Causes of the war (long-term) Nationalism Nationalism Imperialism Imperialism Alliances Alliances Military buildup Military buildup

Immediate cause of the war Assassination of Archduke Franz Ferdinand and his wife of Austria- Hungary by Gavrilo Princip of Serbia Assassination of Archduke Franz Ferdinand and his wife of Austria- Hungary by Gavrilo Princip of Serbia

Key “Allied Powers”  Great Britain  France  Italy  Russia (pulled out of the war in 1917)  US (entered in 1917)

Key “Central Powers” Germany Germany Austria-Hungary Austria-Hungary Ottoman Empire Ottoman Empire Bulgaria Bulgaria

Allied vs. Central Powers

New technologies of war Trench warfare

Poison (mustard) Gas

Machine gun

Tank

Submarine (or U-boat in Germany)

Airplane Manfred von Richthofen—Red Baron Manfred von Richthofen—Red Baron Edward Rickenbacker— American Ace Edward Rickenbacker— American Ace

The US tried to stay neutral, but… We lent money to the Allies We lent money to the Allies Germany created a blockade around Britain and sank boats with any supplies we tried to give the Allies Germany created a blockade around Britain and sank boats with any supplies we tried to give the Allies Britain also created a blockade around Germany, starving about 750,000 civilians Britain also created a blockade around Germany, starving about 750,000 civilians

May 7, 1915—Germany sinks the Lusitania, killing 128 Americans

Germany had warned us

FURTHER EVENTS  Sussex is attacked in March 1916  Germany makes Sussex Pledge, promising to warn ocean liners before attacking them  Germany resumes full-scale U-boat warfare in February 1917

Zimmermann Note, March 1917

In this note…. Germany asks Mexico for support in exchange for helping Mexico get back territories lost to the US

US enters the war—April 6, 1917