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Assassination of Archduke Ferdinand
The objective was to break off Austria-Hungary South Slav provinces so they could be combined into a Yugoslavia. The assassnation led to the First World War when Austria-Hungary gave Serbia an ultimatum, and it was rejected. -
Schlieffen Plan
Schlieffecn Plan was the name given to the planning of the German invasion of France and Belgium in August 1914.
305,000 casualties -
Period: to
Trench Warfare
The soldiers of the Triple Alliance and the Triple Entente began to dig long, deep holes where soldiers fought to guard themselves from enemy fire. -
Christmas Truce of 1914
Pope Benedict XV suggested a temporary hiatus of the war for the celebration of Christmas. The warring countries refused to create any official cease-fire, but on Christmas the soldiers in the trenches declared their own unofficial truce -
Germans introduce poison gas
German forces shock Allied soldiers along the western front by firing more than 150 tons of lethal chlorine gas against two French colonial divisions at Ypres, Belgium
Around 1,000 killed -
Sinking of Lusitania
Almost all her hidden cargo consisted of munitions and contraband destined for the British war effort. German torpedo crashed into it. It sunk, killing 1,119 people -
Sussex Pledge
promised a change in Germany's naval warfare policy. These Elements of the undertaking:
Passenger ships would not be targeted;
Merchant ships would not be sunk until the presence of weapons had been established, if necessary by a search of the ship;
Merchant ships would not be sunk without provision for the safety of passengers and crew. -
Period: to
Battle of Verdun
One of the largest battles of the First World War on the Western Front between the German and French armies. -
Zimmerman Telegram
proposed a military alliance between Germany and Mexico in the event of the United States' entering World War I against Germany. -
General John J. Pershing became AEF leader
Pershing aimed to maintain the independence of the AEF, his willingness to integrate into Allied operations helped bring about the armistice with Germany -
Wilson asks for declaration of war
President Woodrow Wilson asks Congress to send U.S. troops into battle against Germany in World War I. Four days later, Congress obliged and declared war on Germany. -
Committee on Public Information formed
an independent agency of the government of the United States created to influence U.S. public opinion regarding American participation in World War I -
Selective Service Act became law
all male U.S. citizens and male immigrant non-citizens between the ages of 18 and 25 are required by law to have registered within 30 days of their 18th birthday -
Period: to
Battle of Argonne Forest
was a major part of the final Allied offensive of World War I that stretched along the entire Western Front
192,000 casualties -
World War I ended
The first world war ends. around 22,477,500 casualties
