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> World War I
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12 The spread of war
12.1
1914
July 28
:
Austria-Hungary
declares war on
Serbia
.
August 1
:
Germany
declares war on
Russia
.
August 2
: German troops occupy
Luxembourg
August 3
: Germany declares war on
France
August 4
: Germany invades neutral
Belgium
; the
United Kingdom
declares war on Germany in response.
August 10
: Austria-Hungary declares war on Russia.
August 12
: The United Kingdom and France declare war on Austria-Hungary.
August 14
:
Austrian
and
Serbian
forces meet at
Cer
August 19
: Austrian forces defeated by Serbians at Cer
August 20
: German forces occupy
Brussels
August 23
:
Japan
declares war on Germany
September
: Unity Pact signed by France, Britain, and Russia
October 9
:
Siege of Antwerp
—
Antwerp
,
Belgium
falls to German troops.
October 29
: The
Ottoman Empire
enters the war on the side of Germany and Austria-Hungary.
November 2
: Russia declares war on
Turkey
.
November 5
: France and United Kingdom declare war on Turkey.
12.2
1915
April 24
: The events commonly referred to as the
Armenian Genocide
begin in the Ottoman Empire
April 25
:
Gallipoli
campaign commences
April 26
:
Italy
secretly signs the
London Pact
with the
Triple Entente
May 23
: Italy declares war on
Austria-Hungary
October 14
:
Bulgaria
declares war on
Serbia
and enters the war on the side of Germany and Austria-Hungary
12.3
1916
March 9
: Germany declares war on
Portugal
(see
Portugal in the Great War
)
August 27
:
Romania
declares war on Austria-Hungary
August 28
: Italy declares war on Germany
September 15
:
Battle of the Somme
— two men die for every
centimetre
of land captured
12.4
1917
February 24
:
United States
ambassador to the United Kingdom Walter H. Page is given the
Zimmermann Telegram
, in which the
German Empire
offers to give the
American Southwest
back to
Mexico
if Mexico declares war on the
United States
April 6
: The United States declares war on Germany.
June 27
:
Greece
enters the war on the side of the Allies.
August 14
: The
Republic of China
declares war on Germany.
October 26
:
Brazil
declares war on Germany.
December 7
: United States declares war on Austria-Hungary.
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