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''Main article: [[Causes of World War I]]''

''Main article: [[Causes of World War I]]''

On June 28, 1914, a team of Serbian nationalist assassins killed the [[Austrian]] [[Archduke Franz Ferdinand]] and his wife Sophie in [[Sarajevo]]. This action led to Austria-Hungary giving an ultimatum <ref>http://teachers.sduhsd.k12.ca.us/mmontgomery/world_history/world_war1/ultimatum.htm</ref> to Serbia. Serbia agreed to comply with all of the demands, except the ones which violated their sovereignty, and, due to a number of military alliances throughout Europe, a full scale war was soon in progress. Serbia requested support from its ally, [[Russia]], which mobilized its military forces. This mobilization led to [[Germany]] invading both Russia and [[France]] (which had an existing alliance with Russia), which was a part of Germany's [[Schlieffen Plan]] of war on two fronts. En route to France, German forces passed through neutral [[Belgium]]. The violation of this [[neutrality]] led [[Britain]] to declare war on Germany.  [[Italy]] had an alliance with Germany and Austria-Hungary, but refused to join the war.

On June 28, 1914, a Serbian nationalist group of assassins known as The Black Hand, killed the [[Austrian]] [[Archduke Franz Ferdinand]] and his wife Sophie in [[Sarajevo]]. This action led to Austria-Hungary giving an ultimatum <ref>http://teachers.sduhsd.k12.ca.us/mmontgomery/world_history/world_war1/ultimatum.htm</ref> to Serbia. Serbia agreed to comply with all of the demands, except the ones which violated their sovereignty, and, due to a number of military alliances throughout Europe, a full scale war was soon in progress. Serbia requested support from its ally, [[Russia]], which mobilized its military forces. This mobilization led to [[Germany]] invading both Russia and [[France]] (which had an existing alliance with Russia), which was a part of Germany's [[Schlieffen Plan]] of war on two fronts. En route to France, German forces passed through neutral [[Belgium]]. The violation of this [[neutrality]] led [[Britain]] to declare war on Germany.  [[Italy]] had an alliance with Germany and Austria-Hungary, but refused to join the war.

Alternative theories cite the building of the Berlin-Baghdad railway and the problems it would have created for England. <ref>http://stinet.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA138432</ref>

Alternative theories cite the building of the Berlin-Baghdad railway and the problems it would have created for England. <ref>http://stinet.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA138432</ref>