To start things off by sharing my own opinion, I've decided to break things down by listing the eight basic factors that I believe were responsible for starting the war. Under these eight categories are a brief description followed by my attempt to numerically quantify the share of the blame for each country involved.
ColonizationGermany scrambles to keep up with Britain & France who are constantly expanding their territories and influence around the globe. Meanwhile Russia, looking to strengthen its position in the Balkans and dominate the Black Sea region increases tensions with the Ottoman Empire.
Share of the BlameGermany - 30%
England - 30%
France - 25%
Russia - 15%
MilitarismThe arms race between Britain and Germany is in full gear particularly on the high seas. Germany is the only country who does not support disarmament at the Second Hague Conference in 1907, while distancing itself diplomatically from the United States. The First Hague Conference in 1898 was called for by Russian Tsar Nicholas II.
Share of the BlameGermany - 60%
England - 40%
NationalismThe reunification of Italy (1861) and German (1871) is a not so distant memory, and lingering bitterness towards Britain and Russia for the role they played in dividing the states consumed Germany. Meanwhile tensions between Austria and Serbia, populated by those from different ethnic backgrounds, has reached alarming levels.
Share of the BlameGermany - 20%
England - 20%
Russia - 20%
Austria - 15%
Serbia - 15%
France - 10%
Alliances1879 - Germany & Austria-Hungary enter into a duel alliance against Russia
1881 - Germany & Austrian alliance stopping Russia from gaining control of Serbia
1882 - Germany & Austria create alliance with Italy to prevent Russo-Italian alliance
1894 - Franco-Russian Alliance is formed for greater Russian protection from Austria-Hungary and Germany
1904 - The Entente Cordiale is established between France and Britain
1907 - The Anglo-Russian Entente is formed between Britain and Russia
1907 - The Triple Entente of Russia, France and Britain is formed to counter the German threat
1914 - The Triple Entente countries sign agreement vowing that they will not seek a separate peace with Germany
Share of the BlameRussia - 25%
England - 20%
France - 20%
Germany - 15%
Austria - 15%
Italy - 5%
Moroccan & Bosnian Crisis / Balkan WarsGermany almost goes to war with France over the possession of Morocco, given to the French by England in 1904. The Germans are unsuccessful however in trying to drive a wedge between Britain and France. Meanwhile a war between Serbian backed Russia and Austrian backed Germany nearly breaks out over the rightful possession of Bosnia. Russia backs down ending the immediate threat, but war in the Balkans in 1911 creates greater regional instability.
Share of the BlameGermany - 30%
Austria - 15%
Serbia - 15%
Russia - 10%
England - 10%
France - 10%
Greece - 2%
Bulgaria - 2%
Romania - 2%
Ottoman Empire - 2%
Montenegro - 2%
PolicyAustrian Emperor Franz Joseph ruled over Serbia with an iron fist, and the Serbian population grew increasingly radical in the years leading up to the war. Despite progressive measures towards the Serbs intended by Joseph's ill-fated successor Franz Ferdinand, relations between the two countries was a powder keg ready to explode.
Share of the BlameAustria - 60%
Serbia - 40%
AssassinationAustrian Archduke Franz Ferdinand and his wife Sophie are assassinated in Sarajevo by a radical Serbian member of the "Black Hand" named Gavrilo Princip. Questions linger as to the organization's affiliation with the Serbian government, denied officially by the Serbs. The Austrians are skeptical and press for war against Serbian.
Share of the BlameSerbia - 60%
Austria - 40%
RelationsDespite familial connections between three of the four great leaders of conflict no resolution can be made between Tsar Nicholas II Russia, King George V of England and Kaiser Wilhelm II of Germany.
Share of the BlameRussia - 33%
Germany - 33%
Britain - 33%
TOTAL BLAME ASSESSMENT
Germany - 24%
England - 19%
Austria - 18%
Serbia - 16%
Russia - 13%
France - 8%
Italy - 0.5%
Greece, Bulgaria, Romania, Ottoman Empire, Montenegro - <0.5% ea.
[/size]