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In 1882, Germany, Austria-Hungary and Italy had been parties of a secret agreement between them according an alliance.
The problem was that Italy, entered WW1 in opposition to Germany and Austria-Hungary, so later on retired from this alliance.
The Ottoman Empire joined on October 29th 1914
Bulgaria also joined on October 14th 1915 -
It started in 1907 with France, Great Britain and Russia.
Later on, Serbia entered.
When attacked by Germany, Belgium joined.
In August 1914 Japan entered aspiring to snitch German colonies of the Pacific.
In May 1915 Italy joined.
In March 1916 Portugal entered.
In June 1916 Romania joined.
In April 1917 the United States entered.
In June 1917 Greece joined.
Also China and some South American countries entered. -
Archduke Franz Ferdinand, the heir to the throne of Austria-Hungary, was shot and killed by a Serbian man who thought Serbia should control Bosnia instead of Austria.
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Archduke Franz Ferdinand's assasination, was the straw that broke the camel's back in Europe, and because of this Austria-Hungary declared the war to Serbia on 28th July 1914
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Because of the assassination of the archduke, as Austria-Hungary thought that Serbia's government planned it, declared the war.
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Germany got involved in the War as it had an alliance with Austria-Hungary, so also declared war to Serbia
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Russia got involved because Russia had an alliance with Serbia. So, Germany then declared war on Russia because Germany had an alliance with Austria-Hungary.
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Russia got involved in the war, as it had an alliance with Serbia, so Germay declared them the war
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France got involved, as it had an alliance with Russia.
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France got involved in the war, as it had an alliance with Russia, so Germany declared France the war
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Britain declared war on Germany because of its invasion of neutral Belgium. Britain had agreements to protect both Belgium and France.
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Briain got involved in the war, as it had an alliance with France and Russia, so declared the war to Germany
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Occured in Marne River, France
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Occured in Ypres, Belgium
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Occured in Verdun, France
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Occured in the North Sea
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Occured in Somme River, France
Many battles were fought using trench warfare. Long ditches were dug in the ground. Soldiers lived in the trenches and sometimes climbed out to attack. A famous example of trench war was the this battle. Around one million soldiers were killed, wounded or missing. -
Occured in Cambrai, France
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On the 11th November 1918, Germany realiced that was in a very bad possition, and couldn't win the war, so had to sign an armistice retiring themselfs as loosers of the war, ending up that way, the big war.
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Lots of peace conferences occured between 1919 and 1920, most of them between "the big 4", that met informally 145 times. This ended up in the Treaty of Versailles
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The Treaty of Versailles established what Germany must do for "causing the war" and was signed on 28 June 1919
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On 28th June 1919, the Treaty of Versailles was signed. This treaty was so harshy to Germany, that ended up on the WW2
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The Treaty of Versailles, signed on 28th June 1919, established the creation of the League of Nations, an international diplomatic group with the objective of preventing wars, that was finally created on 10th January 1920