Check out http://www.firstworldwar.com/features/declarationsofwar.htm
Here's how the dominos fell in WWI:
Archduke Franz Ferdinand of Austria assassination on 28 June 1914
Austria-Hungary declared war on Serbia on 28 July 1914
Russia, Germany & France mobilize over the next few days.
Germany declared war on Russia on 1 Aug 1914
Canada, France, Russia, Belgium, and the UK were all in a state of war with Germany, A-H within 2 weeks.
Italy, Greece, Turkey and the USA entered the war somewhat later.
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The assassination of Austria-Hungary's Archduke Franz Ferdinand, who was the brother of Austria-Hungary's ruler Franz-Josef, by a Serbian terrorist Gavrillo Princip on June 28, 1914 caused AH to declare war on Serbia. Due to various treaties signed by both the sides almost all of the European countries entered the war. This was the immediate reason for the declaration of World War I .
Austria-Hungary declared war on Serbia, after a Serb killed the Archduke Ferdinand and Duchess Sophia.
The first declaration of war was on July 28th, 1914, when Austria-Hungary declared war on Serbia.
The first world war started in 1916.
the first world war started in 14 june 1914
The first war was started in 1914 and which was fought about 4 years and 3 months.
The First World War ended in 1918, World War 2 started in 1939, so there was 21 years between them.